CVE-2026-55805

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 5.4 from GitHub Security Advisory published 2026-08-26. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Stored XSS. This issue affects Drupal core versions: from 0.0.0 to 10.6.13, from 11.3.0 to 11.3.14, from 11.4.0 to 11.4.4, from 0.0.0 to 11.0.*, from 0.0.0 to 11.1.*, from 0.0.0 to 11.2.*.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

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 (value × EchelonGraph’s weight)
Severity54% × 45%
The EG Score, 5.4 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
12th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 25, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 26, 2026
Patch available.
Web page

Drupal core - Moderately critical - Cross-site scripting - SA-CORE-2026-012 | Drupal.org

https://www.drupal.org/sa-core-2026-012

Vendor Advisories for CVE-2026-55805(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 rangeFix by version rangeDependents
drupal/core10.0.0 ... 9.5.9 (493 versions)
  • every version up to 10.6.13: fixed in 10.6.13
  • 11.3.0 up to 11.3.14: fixed in 11.3.14
  • 11.4.0 up to 11.4.4: fixed in 11.4.4
  • 11.0.0 up to 11.1.0: fixed in 11.1.0
  • 11.1.0 up to 11.2.0: fixed in 11.2.0
  • 11.2.0 up to 11.3.0: fixed in 11.3.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 80× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 137 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 37 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  9. 2026-10-10 10:01 UTCEG score recompute
  10. 2026-10-10 10:01 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  12. 2026-10-09 05:57 UTCEG score recompute
  13. 2026-10-09 05:57 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  14. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  15. 2026-10-08 06:34 UTCEG score recompute
  16. 2026-10-08 06:34 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  18. 2026-10-07 07:10 UTCEG score recompute
  19. 2026-10-07 07:10 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  20. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  21. 2026-10-06 07:38 UTCEG score recompute
  22. 2026-10-06 07:38 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  23. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  24. 2026-10-05 04:52 UTCEG score recompute
  25. 2026-10-05 04:52 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
Show 75 more
  1. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  2. 2026-10-04 05:28 UTCEG score recompute
  3. 2026-10-04 05:28 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  4. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  5. 2026-10-03 06:06 UTCEG score recompute
  6. 2026-10-03 06:06 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  7. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  8. 2026-10-02 06:24 UTCEG score recompute
  9. 2026-10-02 06:24 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  11. 2026-10-01 05:42 UTCEG score recompute
  12. 2026-10-01 05:42 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  13. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  14. 2026-09-30 06:20 UTCEG score recompute
  15. 2026-09-30 06:20 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  16. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  17. 2026-09-28 21:24 UTCEG score recompute
  18. 2026-09-28 21:24 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  19. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  20. 2026-09-27 20:53 UTCEG score recompute
  21. 2026-09-27 20:53 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  23. 2026-09-26 21:31 UTCEG score recompute
  24. 2026-09-26 21:31 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  25. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  26. 2026-09-25 01:05 UTCEG score recompute
  27. 2026-09-25 01:05 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  28. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  29. 2026-09-24 01:43 UTCEG score recompute
  30. 2026-09-24 01:42 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  31. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  32. 2026-09-23 02:20 UTCEG score recompute
  33. 2026-09-23 02:20 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  34. 2026-09-22 02:57 UTCEG score recompute
  35. 2026-09-22 02:57 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  36. 2026-09-21 03:34 UTCEG score recompute
  37. 2026-09-21 03:34 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  38. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  39. 2026-09-20 04:11 UTCEG score recompute
  40. 2026-09-20 04:11 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  41. 2026-09-19 04:49 UTCEG score recompute
  42. 2026-09-19 04:49 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  43. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  44. 2026-09-18 05:25 UTCEG score recompute
  45. 2026-09-18 05:25 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  46. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  47. 2026-09-17 06:03 UTCEG score recompute
  48. 2026-09-17 06:03 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  49. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  50. 2026-09-16 06:31 UTCEG score recompute
  51. 2026-09-16 06:31 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  52. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  53. 2026-09-15 07:09 UTCEG score recompute
  54. 2026-09-15 07:09 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  55. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  56. 2026-09-14 07:46 UTCEG score recompute
  57. 2026-09-14 07:46 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  58. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  59. 2026-09-13 08:23 UTCEG score recompute
  60. 2026-09-13 08:23 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  61. 2026-09-12 09:01 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  62. 2026-09-11 09:38 UTCEG score recompute
  63. 2026-09-11 09:38 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  64. 2026-09-10 10:15 UTCEG score recompute
  65. 2026-09-10 10:15 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  66. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  67. 2026-09-09 10:52 UTCEG score recompute
  68. 2026-09-09 10:52 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  69. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  70. 2026-09-08 11:29 UTCEG score recompute
  71. 2026-09-08 11:29 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  72. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  73. 2026-09-07 09:57 UTCEG score recompute
  74. 2026-09-07 09:57 UTCGHSA enrichmentGHSA-vqm5-mjxv-776v · GitHub CVSS 5.4
  75. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile

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Frequently asked(5)

What is CVE-2026-55805?
CVE-2026-55805 is a medium-severity vulnerability; its CVE record was published on August 25, 2026. Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Stored XSS. This issue affects Drupal core versions: from 0.0.0 to 10.6.13, from 11.3.0 to 11.3.14, from 11.4.0 to 11.4.4, from 0.0.0 to 11.0., from 0.0.0 to 11.1., from…
When was CVE-2026-55805 made public?
CVE-2026-55805 was made public on July 15, 2026: that is the date its CVE record's CNA, Drupal.org, gives for when the vulnerability was made public. The CVE record itself was published on August 25, 2026. EchelonGraph's copy of the record carries a last-modified date of August 28, 2026; the record at its source may have been updated since.
Is CVE-2026-55805 actively exploited?
CVE-2026-55805 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (12th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55805?
CVE-2026-55805 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-55805?
A fix for CVE-2026-55805 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55805 are linked in the Vendor Advisories panel on this page.

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