CVE-2026-92288

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
9.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.1Exploit: Elevated riskExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

Lemonldap::NG::Portal versions from 2.20.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow unauthenticated OAuth2 token introspection because checkEndPointAuthenticationCredentials does not verify the client secret of a public Relying Party.

checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the authentication method deduced from the request, client_secret_basic or client_secret_post. introspection() rejects a caller only when that method is missing or none, so a request carrying a public client_id and an arbitrary or empty secret passes the endpoint's authentication check.

An attacker who holds an access token and knows the client_id of any public Relying Party can confirm the token is active and read its metadata, including scope, audience, expiry and the sub claim. The sub claim is computed with the calling Relying Party's user identifier attribute, so an attacker can translate a user identifier from one Relying Party to another, defeating per-client and pseudonymous identifiers.

CVSS v3
9.1
EG Score
9.1CRITICALhigh confidence
EG Risk
72
EG Risk 72/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 25, 2026

Last Modified

September 25, 2026

Advisory Details (4)

Auto-updated Sep 25, 2026
No patch confirmed yet.
generic

Version 2.21.6 LTS · LemonLDAP NG / lemonldap-ng · GitLab

https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.21.6
generic

Version 2.23.4 · LemonLDAP NG / lemonldap-ng · GitLab

https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.23.4
generic

[Security:medium] OIDC: public clients are treated as authenticated with any client secret (#3721) · Issues · LemonLDAP NG / lemonldap-ng · GitLab

https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3721
generic

[Security:medium, CVE-2026-92288, CVE-2026-92289] OIDC: public clients are treated as authenticated with any client secret (#3719) · Issues · LemonLDAP NG / lemonldap-ng · GitLab

https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719

Vendor Advisories for CVE-2026-92288(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
lemonldap-ng2.21.2+ds-1, 2.21.2+ds-1+deb13u1, 2.21.2+ds-1+deb13u2, 2.21.2+ds-1+deb13u3
  • every version up to 2.21.2+ds-1+deb13u4: fixed in 2.21.2+ds-1+deb13u4
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 60× in last 7d / 94× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-05 08:56 UTCGHSA enrichment
  2. 2026-10-05 05:13 UTCGHSA enrichment
  3. 2026-10-05 01:33 UTCEG score recompute
  4. 2026-10-05 01:33 UTCGHSA enrichment
  5. 2026-10-04 23:22 UTCEPSS rescore
  6. 2026-10-04 21:53 UTCGHSA enrichment
  7. 2026-10-04 18:13 UTCGHSA enrichment
  8. 2026-10-04 14:32 UTCGHSA enrichment
  9. 2026-10-04 10:51 UTCGHSA enrichment
  10. 2026-10-04 07:08 UTCGHSA enrichment
  11. 2026-10-04 03:28 UTCGHSA enrichment
  12. 2026-10-03 23:49 UTCGHSA enrichment
  13. 2026-10-03 20:07 UTCGHSA enrichment
  14. 2026-10-03 16:24 UTCEG score recompute
  15. 2026-10-03 16:24 UTCGHSA enrichment
  16. 2026-10-03 12:43 UTCGHSA enrichment
  17. 2026-10-03 09:03 UTCGHSA enrichment
  18. 2026-10-03 05:22 UTCGHSA enrichment
  19. 2026-10-03 01:42 UTCGHSA enrichment
  20. 2026-10-02 22:02 UTCGHSA enrichment
  21. 2026-10-02 18:22 UTCEG score recompute
  22. 2026-10-02 18:22 UTCGHSA enrichment
  23. 2026-10-02 18:22 UTCGHSA enrichment
  24. 2026-10-02 14:42 UTCGHSA enrichment
  25. 2026-10-02 11:01 UTCGHSA enrichment
Show 69 more
  1. 2026-10-02 07:22 UTCGHSA enrichment
  2. 2026-10-02 03:42 UTCGHSA enrichment
  3. 2026-10-02 00:03 UTCGHSA enrichment
  4. 2026-10-01 19:55 UTCEG score recompute
  5. 2026-10-01 19:55 UTCGHSA enrichment
  6. 2026-10-01 19:51 UTCEPSS rescore
  7. 2026-10-01 16:15 UTCGHSA enrichment
  8. 2026-10-01 12:35 UTCGHSA enrichment
  9. 2026-10-01 08:56 UTCGHSA enrichment
  10. 2026-10-01 05:15 UTCGHSA enrichment
  11. 2026-10-01 01:35 UTCGHSA enrichment
  12. 2026-09-30 21:56 UTCGHSA enrichment
  13. 2026-09-30 18:16 UTCEG score recompute
  14. 2026-09-30 18:16 UTCGHSA enrichment
  15. 2026-09-30 15:04 UTCEPSS rescore
  16. 2026-09-30 14:37 UTCGHSA enrichment
  17. 2026-09-30 10:55 UTCGHSA enrichment
  18. 2026-09-30 07:12 UTCGHSA enrichment
  19. 2026-09-30 03:32 UTCGHSA enrichment
  20. 2026-09-29 23:52 UTCGHSA enrichment
  21. 2026-09-29 19:58 UTCGHSA enrichment
  22. 2026-09-29 16:16 UTCEG score recompute
  23. 2026-09-29 16:16 UTCGHSA enrichment
  24. 2026-09-29 12:34 UTCGHSA enrichment
  25. 2026-09-29 08:54 UTCGHSA enrichment
  26. 2026-09-29 05:15 UTCGHSA enrichment
  27. 2026-09-29 01:35 UTCGHSA enrichment
  28. 2026-09-28 21:56 UTCEG score recompute
  29. 2026-09-28 21:56 UTCGHSA enrichment
  30. 2026-09-28 18:16 UTCGHSA enrichment
  31. 2026-09-28 14:36 UTCEG score recompute
  32. 2026-09-28 14:36 UTCGHSA enrichment
  33. 2026-09-28 13:52 UTCEPSS rescore
  34. 2026-09-28 13:52 UTCEPSS rescore
  35. 2026-09-28 10:56 UTCGHSA enrichment
  36. 2026-09-28 07:17 UTCGHSA enrichment
  37. 2026-09-28 03:37 UTCGHSA enrichment
  38. 2026-09-27 23:56 UTCGHSA enrichment
  39. 2026-09-27 20:16 UTCGHSA enrichment
  40. 2026-09-27 16:36 UTCEG score recompute
  41. 2026-09-27 16:36 UTCGHSA enrichment
  42. 2026-09-27 13:49 UTCEPSS rescore
  43. 2026-09-27 12:57 UTCGHSA enrichment
  44. 2026-09-27 09:17 UTCGHSA enrichment
  45. 2026-09-27 05:37 UTCGHSA enrichment
  46. 2026-09-27 01:56 UTCGHSA enrichment
  47. 2026-09-26 22:16 UTCGHSA enrichment
  48. 2026-09-26 18:37 UTCEG score recompute
  49. 2026-09-26 18:37 UTCGHSA enrichment
  50. 2026-09-26 15:59 UTCEPSS rescore
  51. 2026-09-26 14:55 UTCGHSA enrichment
  52. 2026-09-26 11:13 UTCGHSA enrichment
  53. 2026-09-26 07:31 UTCGHSA enrichment
  54. 2026-09-26 03:48 UTCEG score recompute
  55. 2026-09-26 03:47 UTCGHSA enrichment
  56. 2026-09-26 00:04 UTCGHSA enrichment
  57. 2026-09-25 20:20 UTCEG score recompute
  58. 2026-09-25 20:20 UTCGHSA enrichment
  59. 2026-09-25 16:27 UTCEG score recompute
  60. 2026-09-25 16:27 UTCGHSA enrichment
  61. 2026-09-25 15:49 UTCEG score recompute▲ 9.10
  62. 2026-09-25 15:49 UTCGHSA enrichment
  63. 2026-09-25 15:49 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  64. 2026-09-25 13:39 UTCGHSA enrichment
  65. 2026-09-25 03:21 UTCNVD update
  66. 2026-09-25 02:22 UTCMITRE cvelistV5
  67. 2026-09-25 01:18 UTCNVD update
  68. 2026-09-25 00:54 UTCEG score recompute
  69. 2026-09-25 00:53 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-92288?
CVE-2026-92288 is a critical vulnerability published on September 25, 2026. Lemonldap::NG::Portal versions from 2.20.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow unauthenticated OAuth2 token introspection because checkEndPointAuthenticationCredentials does not verify the client secret of a public Relying Party. checkEndPointAuthenticationCredentials() skips…
When was CVE-2026-92288 disclosed?
CVE-2026-92288 was first published on September 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-92288 actively exploited?
CVE-2026-92288 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-92288?
CVE-2026-92288 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-92288?
No fix for CVE-2026-92288 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-92288 are linked in the Vendor Advisories panel on this page.

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