CVE-2026-55809

HIGHPre-NVD 8.19.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-11. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 1.7.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

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

Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Flag attendance field allows Object Injection. This issue affects Flag attendance field versions: from 0.0.0 to 1.2.

CVSS v3
8.1
EG Score
9.8(medium)
EG Risk
—
EPSS
22.9%
KEV
Not listed

Published

July 10, 2026

Last Modified

July 14, 2026

Advisory Details (1)

Auto-updated Jul 13, 2026
No patch confirmed yet.
generic

Flag attendance field - Critical - PHP object injection - SA-CONTRIB-2026-049 | Drupal.org

https://www.drupal.org/sa-contrib-2026-049

Vendor Advisories for CVE-2026-55809(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 15× in last 7d / 40× 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. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:25 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:31 UTCEPSS rescore
  5. 2026-07-19 14:31 UTCEPSS rescore
  6. 2026-07-19 02:29 UTCEPSS rescore
  7. 2026-07-18 10:04 UTCEPSS rescore
  8. 2026-07-17 04:17 UTCGHSA enrichment
  9. 2026-07-16 23:54 UTCGHSA enrichment
  10. 2026-07-16 19:31 UTCGHSA enrichment
  11. 2026-07-16 17:03 UTCEPSS rescore
  12. 2026-07-16 15:07 UTCGHSA enrichment
  13. 2026-07-16 10:44 UTCGHSA enrichment
  14. 2026-07-16 06:20 UTCGHSA enrichment
  15. 2026-07-16 01:53 UTCGHSA enrichment
  16. 2026-07-15 21:29 UTCGHSA enrichment
  17. 2026-07-15 17:06 UTCGHSA enrichment
  18. 2026-07-15 16:57 UTCEPSS rescore
  19. 2026-07-15 16:57 UTCEPSS rescore
  20. 2026-07-15 12:41 UTCGHSA enrichment
  21. 2026-07-15 08:17 UTCGHSA enrichment
  22. 2026-07-15 03:53 UTCGHSA enrichment
  23. 2026-07-15 02:00 UTCEPSS rescore
  24. 2026-07-15 02:00 UTCEPSS rescore
  25. 2026-07-14 23:30 UTCGHSA enrichment
Show 15 more
  1. 2026-07-14 19:07 UTCGHSA enrichment
  2. 2026-07-14 14:41 UTCGHSA enrichment
  3. 2026-07-14 10:17 UTCGHSA enrichment
  4. 2026-07-14 05:53 UTCGHSA enrichment
  5. 2026-07-14 01:29 UTCEG score recompute▲ 9.80
  6. 2026-07-14 01:29 UTCGHSA enrichment
  7. 2026-07-13 22:31 UTCEPSS rescore
  8. 2026-07-13 18:27 UTCMITRE cvelistV5CVSS v3 → 8.1 · severity → HIGH
  9. 2026-07-13 17:12 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  10. 2026-07-13 06:13 UTCEPSS rescore
  11. 2026-07-13 06:13 UTCEPSS rescore
  12. 2026-07-12 05:46 UTCEPSS rescore
  13. 2026-07-10 22:19 UTCNVD update
  14. 2026-07-10 21:53 UTCEG score recompute
  15. 2026-07-10 21:52 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-55809?
CVE-2026-55809 is a high vulnerability published on July 10, 2026. Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Flag attendance field allows Object Injection. This issue affects Flag attendance field versions: from 0.0.0 to 1.2.
When was CVE-2026-55809 disclosed?
CVE-2026-55809 was first published in the National Vulnerability Database on July 10, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55809 actively exploited?
CVE-2026-55809 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55809?
CVE-2026-55809 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2026-55809?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55809, 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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