CVE-2026-77883

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreHIGH confidence

Score 4.9 from GitHub Security Advisory published 2026-09-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
4.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.9Exploit: None knownExposed: 0

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

Exposure of sensitive information through data queries vulnerability in Apache Syncope.

An administrator with adequate entitlements for Derived Schemas can create a malicious JEXL expression which allows any administrator with sufficient entitlements for User read to access LinkedAccount's (if present) or Manager's (if defined) sensitive information, possibly including hashed credentials.

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
4.9
EG Score
4.9(high)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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
Severity49% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 14, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-77883: Apache Syncope: Information disclosure via one-hop JEXL navigation past the JexlContextBuilder name denylist

http://www.openwall.com/lists/oss-security/2026/09/14/17
generic
https://lists.apache.org/thread/oshwdz2k4cl3042y39zq0yl4qkxbd83p

Vendor Advisories for CVE-2026-77883(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 23× in last 7d / 23× 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 12:42 UTCEG score recompute
  2. 2026-09-19 12:42 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 14:26 UTCEG score recompute
  5. 2026-09-18 14:26 UTCGHSA enrichment
  6. 2026-09-17 16:12 UTCGHSA enrichment
  7. 2026-09-16 17:57 UTCEG score recompute
  8. 2026-09-16 17:57 UTCGHSA enrichment
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-15 19:19 UTCEG score recompute
  12. 2026-09-15 19:19 UTCGHSA enrichment
  13. 2026-09-14 21:04 UTCGHSA enrichment
  14. 2026-09-14 20:21 UTCEG score recompute▲ 4.90
  15. 2026-09-14 20:21 UTCGHSA enrichment
  16. 2026-09-14 20:20 UTCNVD updateCVSS v3 → 4.9 · severity → MEDIUM
  17. 2026-09-14 19:20 UTCGHSA enrichment
  18. 2026-09-14 19:18 UTCNVD update
  19. 2026-09-14 18:26 UTCGHSA enrichment
  20. 2026-09-14 18:24 UTCMITRE cvelistV5
  21. 2026-09-14 13:28 UTCNVD update
  22. 2026-09-14 12:45 UTCEG score recompute
  23. 2026-09-14 12:44 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-77883?
CVE-2026-77883 is a medium vulnerability published on September 14, 2026. Exposure of sensitive information through data queries vulnerability in Apache Syncope. An administrator with adequate entitlements for Derived Schemas can create a malicious JEXL expression which allows any administrator with sufficient entitlements for User read to access LinkedAccount's (if…
When was CVE-2026-77883 disclosed?
CVE-2026-77883 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-2026-77883 actively exploited?
CVE-2026-77883 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 68.6% of all scored CVEs.
What is the CVSS score of CVE-2026-77883?
CVE-2026-77883 has a CVSS v3.1 base score of 4.9 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-77883?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77883, 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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