CVE-2026-41921

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-08-18. The CNA's CVSS baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.4Exploit: None knownExposed services: Not assessed

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

Koha before 26.05.02, 25.11.07, and 25.05.13 contains a stored cross-site scripting vulnerability in the purchase suggestion handler that allows authenticated staff users to inject malicious scripts by submitting unsanitized input through the suggestion save operation. Attackers can supply crafted HTML or script content in fields such as title, author, isbn, publishercode, place, collectiontitle, itemtype, and note, which are stored without sanitization and later rendered in the suggestion list template, causing injected scripts to execute in the browser of any staff user who views the suggestions.

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

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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 18, 2026

Last Modified

October 1, 2026

Advisory Details (4)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

Koha Stored XSS via Purchase Suggestion Handler | Advisories | VulnCheck

https://www.vulncheck.com/advisories/koha-stored-xss-via-purchase-suggestion-handler
generic

Koha 26.05.02 released – Official Website of Koha Library Software

https://koha-community.org/koha-26-05-02-released/
generic

Koha 25.11.07 released – Official Website of Koha Library Software

https://koha-community.org/koha-25-11-07-released/
generic

Koha 25.05.13 released – Official Website of Koha Library Software

https://koha-community.org/koha-25-05-13-released/

Vendor Advisories for CVE-2026-41921(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 17× in last 7d / 75× 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 131 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-41921?
CVE-2026-41921 is a medium vulnerability published on August 18, 2026. Koha before 26.05.02, 25.11.07, and 25.05.13 contains a stored cross-site scripting vulnerability in the purchase suggestion handler that allows authenticated staff users to inject malicious scripts by submitting unsanitized input through the suggestion save operation. Attackers can supply crafted…
When was CVE-2026-41921 disclosed?
CVE-2026-41921 was first published on August 18, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41921 actively exploited?
CVE-2026-41921 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-41921?
CVE-2026-41921 has a CVSS base score of 5.4 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-41921?
No fix for CVE-2026-41921 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-41921 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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