VulnSocial

CVE-2026-40165General

LOWCVSS 8.7 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

authentik is an open-source identity provider. Versions 2025.12.4 and prior, and versions 2026.2.0-rc1 through 2026.2.2 were vulnerable to Authentication Bypass through SAML NameID XML Comment Injection. Due to how authentik extracted the NameID value from a SAML assertion, it was possible for an attacker to trick authentik into only seeing a part of the NameID value, potentially allowing an attacker to gain access to other accounts. This issue could be exploited on an authentik instance with a SAML Source, where the attacker had an account on the SAML Source and the ability to modify their NameID value (commonly username or E-mail), and XML Signing was enabled. The attacker could modify the SAML assertion given to authentik by injecting a comment within the NameID value, which effectively truncated the NameID value to the snippet before the comment, and gave the attacker access to any user account. This issue has been fixed in versions 2025.12.5 and 2026.2.3.

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0.0/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-91CWE-287CWE-436

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Threat summary

  • 4 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 2 signals
  • General: 3 classified signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 2 mentions (2026-05-21); latest day: 1
  • 4 total mentions across 3 days

Deep dive

Activity timeline4 mentions / 3d
01122Mentions · 2026-05-14: 1Mentions · 2026-05-21: 2Mentions · 2026-08-27: 1Technical Details · 2026-05-21: 205-1405-2108-27
Signal classification2 categories
General
375.0%
Disclosure
125.0%
Referenced assets2 URLs
By indicator
Classification over time
DateTotalLabels
2026-05-141
General1
2026-05-212
Disclosure1General1
2026-08-271
General1
Full discourse4 posts
  • BugBunny.ai - Continuous AI Pentesting System@BugBunny_ai
    General

    66 CVE-2025-58434 CVE-2025-59057 CVE-2025-59790 CVE-2025-59792 CVE-2025-61622 CVE-2025-61686 CVE-2025-64756 CVE-2026-21884 CVE-2026-22807 CVE-2026-23630 CVE-2026-27471 CVE-2026-27806 CVE-2026-27955 CVE-2026-28215 CVE-2026-28217 CVE-2026-28351 CVE-2026-28361 CVE-2026-28384 CVE-2026-28396 CVE-2026-28398 CVE-2026-28444 CVE-2026-28445 CVE-2026-29093 CVE-2026-30973 CVE-2026-31888 CVE-2026-33016 CVE-2026-33037 CVE-2026-33038 CVE-2026-33039 CVE-2026-3351 CVE-2026-34037 CVE-2026-34158 CVE-2026-34167 CVE-2026-34170 CVE-2026-34171 CVE-2026-34198 CVE-2026-34532 CVE-2026-34573 CVE-2026-34574 CVE-2026-34595 CVE-2026-34746 CVE-2026-34748 CVE-2026-34749 CVE-2026-34750 CVE-2026-34972 CVE-2026-35214 CVE-2026-35412 CVE-2026-35413 CVE-2026-35441 CVE-2026-40165 CVE-2026-40293 CVE-2026-40302 CVE-2026-40304 CVE-2026-40454 CVE-2026-40914 CVE-2026-41131 CVE-2026-41590 CVE-2026-42883 CVE-2026-42884 CVE-2026-42885 CVE-2026-42886 CVE-2026-43888 CVE-2026-43889 CVE-2026-43998 CVE-2026-43999 CVE-2026-4800

    Post summary

    The text simply enumerates a long list of CVE identifiers without further context, technical details, or actionable information.

    2176862729382.1K
    3.1K followersView on X
  • BugBunny.ai - Continuous AI Pentesting System@BugBunny_ai
    General

    108 CVE-2025-58434 CVE-2025-59057 CVE-2025-59343 CVE-2025-59790 CVE-2025-59792 CVE-2025-61622 CVE-2025-61686 CVE-2025-62228 CVE-2025-62232 CVE-2025-64756 CVE-2026-21884 CVE-2026-22706 CVE-2026-22807 CVE-2026-23630 CVE-2026-24015 CVE-2026-24899 CVE-2026-27471 CVE-2026-27806 CVE-2026-27955 CVE-2026-28215 CVE-2026-28217 CVE-2026-28351 CVE-2026-28361 CVE-2026-28384 CVE-2026-28396 CVE-2026-28398 CVE-2026-28444 CVE-2026-28445 CVE-2026-29093 CVE-2026-30973 CVE-2026-31888 CVE-2026-33016 CVE-2026-33037 CVE-2026-33038 CVE-2026-33039 CVE-2026-33264 CVE-2026-33413 CVE-2026-3351 CVE-2026-34037 CVE-2026-34158 CVE-2026-34167 CVE-2026-34170 CVE-2026-34171 CVE-2026-34198 CVE-2026-34532 CVE-2026-34573 CVE-2026-34574 CVE-2026-34595 CVE-2026-34746 CVE-2026-34748 CVE-2026-34749 CVE-2026-34750 CVE-2026-34972 CVE-2026-35214 CVE-2026-35412 CVE-2026-35413 CVE-2026-35441 CVE-2026-40006 CVE-2026-40007 CVE-2026-40009 CVE-2026-40165 CVE-2026-40293 CVE-2026-40302 CVE-2026-40304 CVE-2026-40452 CVE-2026-40454 CVE-2026-40914 CVE-2026-41131 CVE-2026-41590 CVE-2026-42275 CVE-2026-42883 CVE-2026-42884 CVE-2026-42885 CVE-2026-42886 CVE-2026-43888 CVE-2026-43889 CVE-2026-43998 CVE-2026-43999 CVE-2026-44247 CVE-2026-44309 CVE-2026-44310 CVE-2026-44442 CVE-2026-44446 CVE-2026-44705 CVE-2026-44947 CVE-2026-45022 CVE-2026-45090 CVE-2026-45720 CVE-2026-45723 CVE-2026-45726 CVE-2026-46553 CVE-2026-46554 CVE-2026-47733 CVE-2026-4800 CVE-2026-48978 CVE-2026-49478 CVE-2026-50285 CVE-2026-52808 CVE-2026-52809 CVE-2026-53926 CVE-2026-53928 CVE-2026-53929 CVE-2026-53930 CVE-2026-56842 CVE-2026-60076 CVE-2026-60077 CVE-2026-75605 CVE-2026-9103

    Post summary

    The provided text is a bare list of CVE identifiers without additional context, description, or any of the defined indicators.

    30124138.4K
    4.0K followersView on X
  • Infoflowcloud@infoflowcloud
    General

    🚨*CVE* CVE-2026-40165 authentik is an open-source identity provider. Versions 2025.12.4 and prior, and versions 2026.2.0-rc1 through 2026.2.2 were vulnerable to Authentication Bypass throu… https://www.cve.org/CVERecord?id=CVE-2026-40165 ----- Traducción: CVE-2026-40165 aut… http://infoflow.cloud`

    Post summary

    The post identifies CVE-2026-40165 affecting authentik with authentication bypass in specific releases, but provides no additional exploitation or mitigation details.

    0000041
    79 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-40165 authentik is an open-source identity provider. Versions 2025.12.4 and prior, and versions 2026.2.0-rc1 through 2026.2.2 were vulnerable to Authentication Bypass throu… https://www.cve.org/CVERecord?id=CVE-2026-40165

    Post summary

    The tweet discloses an authentication bypass vulnerability in specific authentik releases, but provides no proof of concept, exploit code, or patch information.

    00000318
    57.5K followersView on X

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