CVE-2026-55803

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2026-07-11. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: None knownExposed: 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 Drupal core allows Object Injection. This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0.*, from 0.0.0 to 11.1.*.

CVSS v3
5.9
EG Score
5.9(medium)
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
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

July 10, 2026

Last Modified

July 16, 2026

Advisory Details (1)

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

Drupal core - Critical - PHP object injection - SA-CORE-2026-005 | Drupal.org

https://www.drupal.org/sa-core-2026-005

Vendor Advisories for CVE-2026-55803(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)
Packagist(1)
PackageVulnerable rangeFixed inDependents
drupal/core10.0.0 ... 9.5.9 (477 versions)11.2.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 81× 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.

Showing the most recent 100 of 126 total refreshes for this CVE.

  1. 2026-08-30 06:00 UTCEG score recompute
  2. 2026-08-30 06:00 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-27 23:22 UTCEG score recompute
  6. 2026-08-27 23:22 UTCGHSA enrichment
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-27 01:09 UTCEG score recompute
  9. 2026-08-27 01:09 UTCGHSA enrichment
  10. 2026-08-26 14:46 UTCEPSS rescore
  11. 2026-08-26 02:49 UTCEG score recompute
  12. 2026-08-26 02:49 UTCGHSA enrichment
  13. 2026-08-25 13:49 UTCEPSS rescore
  14. 2026-08-24 20:10 UTCEG score recompute
  15. 2026-08-24 20:10 UTCGHSA enrichment
  16. 2026-08-23 18:22 UTCEG score recompute
  17. 2026-08-23 18:22 UTCGHSA enrichment
  18. 2026-08-23 00:19 UTCEPSS rescore
  19. 2026-08-22 20:10 UTCEG score recompute
  20. 2026-08-22 20:10 UTCGHSA enrichment
  21. 2026-08-21 23:49 UTCEPSS rescore
  22. 2026-08-21 21:57 UTCGHSA enrichment
  23. 2026-08-20 23:42 UTCEG score recompute
  24. 2026-08-20 23:42 UTCGHSA enrichment
  25. 2026-08-20 22:55 UTCEPSS rescore
Show 75 more
  1. 2026-08-20 01:29 UTCEG score recompute
  2. 2026-08-20 01:29 UTCGHSA enrichment
  3. 2026-08-19 17:04 UTCEPSS rescore
  4. 2026-08-18 20:32 UTCEG score recompute
  5. 2026-08-18 20:32 UTCGHSA enrichment
  6. 2026-08-18 13:48 UTCEPSS rescore
  7. 2026-08-17 22:09 UTCEG score recompute
  8. 2026-08-17 22:09 UTCGHSA enrichment
  9. 2026-08-17 13:47 UTCEPSS rescore
  10. 2026-08-16 19:34 UTCEG score recompute
  11. 2026-08-16 19:34 UTCGHSA enrichment
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 20:52 UTCEG score recompute
  15. 2026-08-15 20:52 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 22:39 UTCGHSA enrichment
  18. 2026-08-14 00:27 UTCEG score recompute
  19. 2026-08-14 00:27 UTCGHSA enrichment
  20. 2026-08-13 22:00 UTCEPSS rescore
  21. 2026-08-13 02:15 UTCEG score recompute
  22. 2026-08-13 02:15 UTCGHSA enrichment
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-12 04:03 UTCEG score recompute
  25. 2026-08-12 04:03 UTCGHSA enrichment
  26. 2026-08-11 05:50 UTCEG score recompute
  27. 2026-08-11 05:50 UTCGHSA enrichment
  28. 2026-08-11 00:00 UTCEPSS rescore
  29. 2026-08-10 07:38 UTCEG score recompute
  30. 2026-08-10 07:38 UTCGHSA enrichment
  31. 2026-08-09 13:46 UTCEPSS rescore
  32. 2026-08-09 09:26 UTCEG score recompute
  33. 2026-08-09 09:26 UTCGHSA enrichment
  34. 2026-08-08 16:37 UTCEPSS rescore
  35. 2026-08-08 11:14 UTCEG score recompute
  36. 2026-08-08 11:14 UTCGHSA enrichment
  37. 2026-08-07 13:01 UTCGHSA enrichment
  38. 2026-08-06 14:49 UTCEG score recompute
  39. 2026-08-06 14:49 UTCGHSA enrichment
  40. 2026-08-06 13:47 UTCEPSS rescore
  41. 2026-08-05 19:17 UTCEPSS rescore
  42. 2026-08-05 16:33 UTCGHSA enrichment
  43. 2026-08-04 18:21 UTCEG score recompute
  44. 2026-08-04 18:21 UTCGHSA enrichment
  45. 2026-08-04 15:10 UTCEPSS rescore
  46. 2026-08-04 10:39 UTCEPSS rescore
  47. 2026-08-03 20:09 UTCEG score recompute
  48. 2026-08-03 20:09 UTCGHSA enrichment
  49. 2026-08-03 10:36 UTCEPSS rescore
  50. 2026-08-02 21:56 UTCEG score recompute
  51. 2026-08-02 21:56 UTCGHSA enrichment
  52. 2026-08-02 02:27 UTCEPSS rescore
  53. 2026-08-01 23:44 UTCEG score recompute
  54. 2026-08-01 23:44 UTCGHSA enrichment
  55. 2026-08-01 04:16 UTCEPSS rescore
  56. 2026-08-01 01:32 UTCGHSA enrichment
  57. 2026-07-31 03:15 UTCEG score recompute
  58. 2026-07-31 03:15 UTCGHSA enrichment
  59. 2026-07-30 16:28 UTCEPSS rescore
  60. 2026-07-30 05:03 UTCEG score recompute
  61. 2026-07-30 05:02 UTCGHSA enrichment
  62. 2026-07-30 01:30 UTCEPSS rescore
  63. 2026-07-29 06:50 UTCEG score recompute
  64. 2026-07-29 06:49 UTCGHSA enrichment
  65. 2026-07-28 15:37 UTCEPSS rescore
  66. 2026-07-28 08:33 UTCEG score recompute
  67. 2026-07-28 08:33 UTCGHSA enrichment
  68. 2026-07-27 10:19 UTCEG score recompute
  69. 2026-07-27 10:18 UTCGHSA enrichment
  70. 2026-07-26 14:54 UTCEPSS rescore
  71. 2026-07-26 12:05 UTCEG score recompute
  72. 2026-07-26 12:05 UTCGHSA enrichment
  73. 2026-07-25 14:18 UTCEPSS rescore
  74. 2026-07-24 14:18 UTCEPSS rescore
  75. 2026-07-23 14:18 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-55803?
CVE-2026-55803 is a medium vulnerability published on July 10, 2026. Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Drupal core allows Object Injection. This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0.,…
When was CVE-2026-55803 disclosed?
CVE-2026-55803 was first published in the National Vulnerability Database on July 10, 2026, with the most recent update on July 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55803 actively exploited?
CVE-2026-55803 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 72.0% of all scored CVEs.
What is the CVSS score of CVE-2026-55803?
CVE-2026-55803 has a CVSS v3.1 base score of 5.9 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-55803?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55803, 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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