CVE-2026-118527: Ivanti Connect Secure Generation of Predictable Numbers or Identifiers Vulnerability

Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2026-11-13 as the remediation due date.

Patch available

What, why and how

Ivanti Connect Secure contains a generation of predictable numbers or identifiers vulnerability that allows a remote authenticated attacker to upload files with attacker-controlled content to a known location on disk. This vulnerability can be chained with CVE-2026-104935 and CVE-2026-111357.

What

Why

The product uses a scheme that generates numbers or identifiers that are more predictable than required.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Why

The product uses a scheme that generates numbers or identifiers that are more predictable than required.

How

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2026-10-30.

Public PoC / exploit material

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path: a network path → Generation of Predictable Numbers or Identifiers → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface: Network
Privileges required: Low: a basic authenticated account is required
User interaction: None
Attack complexity: Low: no specialised conditions are recorded
Security boundary: Unchanged: impact remains within the vulnerable component's security authority
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-340 ↗
CWE-340: Generation of Predictable Numbers or Identifiers. The product uses a scheme that generates numbers or identifiers that are more predictable than required.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.ILowIntegrity impact: A successful attack can cause a limited loss.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land: No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.

NetworkCWE-340CISA KEV

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-115872Known-exploited evidence recorded

Use of predictable filenames in Ivanti Connect Secure before versions 25.1.1.3 and 22.8R2.6 allows a remote authenticated attacker to upload files with attacker-controlled content to a known location on disk.

Official EUVD record ↗

Canadian Centre for Cyber Security · English · AV26-1035Ivanti security advisory (AV26-1035) - Update 2

As of October 13, 2026, Ivanti is affected by vulnerabilities in the following products: On October 13, 2026, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-104935 to their Known Exploited Vulnerabilities (KEV) Database.

Official advisory ↗

CERT-FR · French · CERTFR-2026-AVI-1442Avis du CERT-FR

De multiples vulnérabilités ont été découvertes dans Ivanti Connect Secure. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, une élévation de privilèges et un contournement de la politique de sécurité. Ivanti indique que les vulnérabilités CVE-2026-104935, CVE-2026-111357 et CVE-2026-118527 sont activement exploitées.

Official advisory ↗

CSIRT Italia · Italian · ivanti-october-security-update-1Ivanti October Security Update

Di seguito si riportano le vulnerabilità sfruttate che interessano il prodotto Ivanti Connect Secure (ICS). Nel dettaglio: la vulnerabilità identificata tramite la CVE-2026-104935 – di tipo " Authentication Bypass by Spoofing " e con score CVSS v3.1 pari a 8.6 – potrebbe consentire a utenti malintenzionati remoti di sfruttare un meccanismo di falsificazione dell'identità per eludere i controlli di autenticazione ed eseguire codice arbitrario sui sistemi interessati. la vulnerabilità identificata tramite la CVE-2026-111357 - di tipo " Missing authentication for a critical function " e con score CVSS v3.1 pari a 8.8 – è dovuta all'assenza di autenticazione per una funzione critica e potrebbe essere sfruttata da un attaccante locale autenticato per elevare i privilegi utente. la vulnerabilità identificata tramite la CVE-2026-118527 - di tipo " Use of predictable filenames " e con score CVSS v3.1 pari a 4.3 – è dovuta all'utilizzo di nomi di file prevedibili. Un attaccante remoto autenticato potrebbe sfruttare tale vulnerabilità per caricare file con contenuto arbitrario in una posizione nota sul disco.

Official advisory ↗

KISA KrCERT/CC · Korean · KNVD-7038Ivanti 제품 보안 업데이트 권고

Ivanti Connect Secure에서 발생하는 Generation of Predictable Numbers or Identifiers 취약점(CVE-2026-118527) [1]

Official advisory ↗

KISA KrCERT/CC · Korean · KNVD-7036美 CISA 발표 주요 Exploit 정보공유(Update. 2026-10-30)

Ivanti Connect Secure Missing Authentication for Critical Function Vulnerability Ivanti Connect Secure Generation of Predictable Numbers or Identifiers Vulnerability

Official advisory ↗

NCSC-NL · Dutch · NCSC-2026-0416ZeroDay kwetsbaarheden verholpen in Ivanti Connect Secure

Een kwaadwillende kan de kwetsbaarheid (CVE-2026-104935 ) misbruiken om zonder voorafgaande authenticatie willekeurige commando's uit te voeren op het kwetsbare systeem. Ivanti meldt op de hoogte te zijn van rapporten dat de kwetsbaarheid als ZeroDay kwetsbaarheid is misbruikt. Er is (nog) geen publieke Proof-of-Concept (PoC) beschikbaar, maar het NCSC verwacht dat publieke PoC of exploitcode op korte termijn beschikbaar komt, wat de kans op grootschalig misbruik vergroot. **Update: **Ivanti heeft twee nieuwe kwetsbaarheden gepubliceerd (CVE-2026-111357 en CVE-2026-118527), die samen met CVE-2026-104935 actief zijn misbruikt. Naast de toevoeging van deze twee kwetsbaarheden is ook de lijst met kwetsbare versies uitgebreid. Zo is versie 25.1.1.2, die eerder als gepatcht werd beschouwd voor CVE-2026-104935, nog kwetsbaar voor CVE-2026-111357 en CVE-2026-118527.

Official advisory ↗

Patch and workaround

Operational remediation based on structured source evidence.

Status ? Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.: Patch available
Affected: Connect Secure: patch: 22.8R2.6, patch: 25.1.1.3
Fixed: Connect Secure: 25.1.1.3, 22.8R2.6
Action: Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround: No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.

Evidence and provenance

Published 3 Nov 2026 · Last source change 3 Nov 2026, 15:32 UTC · CWE-340 · Generation of Predictable Numbers or Identifiers

CVE recordCVE.org · 5.2

CVSS sourceCNA

EPSS source

The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.

FIRST · tracked since 2026-11-04

European sourceENISA EUVD · EUVD-2026-115872

Product sourceCNA

Remediation sourceCVE/CNA references

CWE sourceCNA

NVD statusNVD enriched

Missing structured fields: affected versions. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗

3 Nov 2026, 20:08 UTC
ENISA known-exploited stateENISA EUVD now records this CVE in its known-exploited dataset.
Before
not listed in ENISA EUVD known-exploited dataset
After
listed in ENISA EUVD known-exploited dataset (EUVD-2026-115872)
ENISA EUVD ↗
3 Nov 2026, 20:07 UTC
ENISA EUVD mappingEUVD-2026-115872 was added to the official ENISA EUVD mapping for this CVE.
Before
not recorded
After
{"euvdId":"EUVD-2026-115872"}
ENISA EUVD ↗
3 Nov 2026, 15:32 UTC
Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: hub.ivanti.com/Security-Advisory-Ivanti-Connect-Secure-CVE-2026-104935?language=en_US.
Before
remediation: hub.ivanti.com/Security-Advisory-Ivanti-Connect-Secure-CVE-2026-104935?language=en_US
After
remediation: hub.ivanti.com/Security-Advisory-Ivanti-Connect-Secure-CVE-2026-104935?language=en_US · vendor advisory: hub.ivanti.com/Security-Advisory-Ivanti-Connect-Secure-CVE-2026-104935?language=en_US
hub.ivanti.com ↗
3 Nov 2026, 14:53 UTC
Vendor guidanceAuthoritative vendor guidance changed: added remediation: hub.ivanti.com/Security-Advisory-Ivanti-Connect-Secure-CVE-2026-104935?language=en_US.
Before
no authoritative guidance recorded
After
remediation: hub.ivanti.com/Security-Advisory-Ivanti-Connect-Secure-CVE-2026-104935?language=en_US
CNA ↗
3 Nov 2026, 14:53 UTC
Affected versionsThe structured affected or fixed version information changed.
Before
No structured affected-product or version range is currently available from the CVE record or NVD. · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
See the vendor and CVE records for the affected range. · Fixed: Connect Secure: 25.1.1.3, 22.8R2.6
CNA ↗
3 Nov 2026, 14:53 UTC
Remediation statusRemediation status changed from Awaiting fix to Patch available.
Before
Awaiting fix
After
Patch available
CNA ↗
3 Nov 2026, 14:53 UTC
SeveritySeverity changed from Unknown to Medium.
Before
Unknown
After
Medium
CNA ↗
3 Nov 2026, 14:53 UTC
CVSS scoreCVSS score changed from not recorded to 4.3 (CVSS 3.1 · CNA · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N).
Before
not recorded
After
4.3 (CVSS 3.1 · CNA · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
CNA ↗
30 Oct 2026, 22:48 UTC
BlackTree coverageBlackTree article coverage changed from no BlackTree article to 1 BlackTree article.
Before
no BlackTree article
After
1 BlackTree article
BlackTree editorial ↗
30 Oct 2026, 18:01 UTC
Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
Before
Awaiting fix
After
Mitigation available
Canadian Centre for Cyber Security ↗
30 Oct 2026, 17:02 UTC
Vendor guidanceAuthoritative vendor guidance changed: removed remediation: cyber.gc.ca/ivanti-security-advisory-av26-1035.
Before
remediation: cyber.gc.ca/ivanti-security-advisory-av26-1035
After
no authoritative guidance recorded
CISA KEV ↗
30 Oct 2026, 17:02 UTC
Remediation statusRemediation status changed from Mitigation available to Awaiting fix.
Before
Mitigation available
After
Awaiting fix
CISA KEV ↗
30 Oct 2026, 17:02 UTC
Catalogue recordCVE added to the BlackTree catalogue.
CISA KEV ↗

2026-11-03CVE published

2026-10-30Added to CISA KEV

2026-11-03Fixed release or patch reference recorded

ENISA EUVD · EUVD-2026-115872↗CISA KEV record↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗

Technical terms and abbreviations used in this report

CVE: Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS: Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS: Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE: Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA: CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP: Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD: National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT: A computer security incident response team that publishes warnings or coordinates incident response.
PoC: Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF: Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL: Living off the land: abuse of legitimate tools or system functions during an attack.

Ivanti Connect Secure Generation of Predictable Numbers or Identifiers Vulnerability

Published severity in operational context

Evidence used

Compensating controls

Verification

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

ENISA European Vulnerability Database

EUVD-2026-115872

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

What changed after publication