CVE-2026-87802

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-14. 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 — 5 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

Improper verification of cryptographic signature vulnerability in Apache Syncope.

When SRA is configured for OAuth 2.0 without JWKS set URI assigned, an attacker can forge arbitrary JWTs to impersonate any user identity and permissions, gaining full access to services proxied by SRA.

This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 through 4.0.7, from 4.1.0-M0 through 4.1.2.

Users are recommended to upgrade to version 4.0.8 / 4.1.3, which fix this issue.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: Track

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%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 14, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-87802: Apache Syncope: SRA OAuth2 JWT signature verification bypass

http://www.openwall.com/lists/oss-security/2026/09/14/25
generic
https://lists.apache.org/thread/gx83cootj00kn8hqd73x1bp8441np33d

Vendor Advisories for CVE-2026-87802(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 51× in last 7d / 51× 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. 2026-09-19 22:15 UTCGHSA enrichment
  2. 2026-09-19 18:08 UTCEG score recompute
  3. 2026-09-19 18:07 UTCGHSA enrichment
  4. 2026-09-19 13:59 UTCGHSA enrichment
  5. 2026-09-19 09:43 UTCGHSA enrichment
  6. 2026-09-19 05:30 UTCGHSA enrichment
  7. 2026-09-19 01:22 UTCGHSA enrichment
  8. 2026-09-18 21:16 UTCEG score recompute
  9. 2026-09-18 21:16 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 16:21 UTCGHSA enrichment
  12. 2026-09-18 12:14 UTCGHSA enrichment
  13. 2026-09-18 08:05 UTCGHSA enrichment
  14. 2026-09-18 03:58 UTCGHSA enrichment
  15. 2026-09-17 23:52 UTCGHSA enrichment
  16. 2026-09-17 19:40 UTCEG score recompute
  17. 2026-09-17 19:40 UTCGHSA enrichment
  18. 2026-09-17 19:32 UTCEPSS rescore
  19. 2026-09-17 15:33 UTCGHSA enrichment
  20. 2026-09-17 11:26 UTCGHSA enrichment
  21. 2026-09-17 07:19 UTCGHSA enrichment
  22. 2026-09-17 03:11 UTCGHSA enrichment
  23. 2026-09-16 23:04 UTCGHSA enrichment
  24. 2026-09-16 18:58 UTCGHSA enrichment
  25. 2026-09-16 14:52 UTCEG score recompute
Show 26 more
  1. 2026-09-16 14:52 UTCGHSA enrichment
  2. 2026-09-16 14:09 UTCEPSS rescore
  3. 2026-09-16 10:43 UTCGHSA enrichment
  4. 2026-09-16 06:34 UTCEG score recompute
  5. 2026-09-16 06:34 UTCGHSA enrichment
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-16 02:28 UTCGHSA enrichment
  8. 2026-09-15 22:21 UTCGHSA enrichment
  9. 2026-09-15 18:14 UTCGHSA enrichment
  10. 2026-09-15 13:36 UTCGHSA enrichment
  11. 2026-09-15 09:29 UTCGHSA enrichment
  12. 2026-09-15 05:21 UTCGHSA enrichment
  13. 2026-09-15 01:11 UTCEG score recompute
  14. 2026-09-15 01:11 UTCGHSA enrichment
  15. 2026-09-14 21:04 UTCGHSA enrichment
  16. 2026-09-14 20:26 UTCGHSA enrichment
  17. 2026-09-14 19:49 UTCEG score recompute▲ 9.10
  18. 2026-09-14 19:49 UTCGHSA enrichment
  19. 2026-09-14 19:49 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  20. 2026-09-14 19:20 UTCGHSA enrichment
  21. 2026-09-14 19:18 UTCNVD update
  22. 2026-09-14 18:27 UTCGHSA enrichment
  23. 2026-09-14 18:24 UTCMITRE cvelistV5
  24. 2026-09-14 11:20 UTCNVD update
  25. 2026-09-14 10:30 UTCEG score recompute
  26. 2026-09-14 10:29 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-87802?
CVE-2026-87802 is a critical vulnerability published on September 14, 2026. Improper verification of cryptographic signature vulnerability in Apache Syncope. When SRA is configured for OAuth 2.0 without JWKS set URI assigned, an attacker can forge arbitrary JWTs to impersonate any user identity and permissions, gaining full access to services proxied by SRA. This issue…
When was CVE-2026-87802 disclosed?
CVE-2026-87802 was first published in the National Vulnerability Database on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87802 actively exploited?
CVE-2026-87802 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 82.3% of all scored CVEs.
What is the CVSS score of CVE-2026-87802?
CVE-2026-87802 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-87802?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87802, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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