CVE-2026-73628

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2026-08-13. A secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Serendipity versions >= 2.3.5 and <= 2.6.0 contain a reflected cross-site scripting vulnerability in the search clean-URL route (/search/). In include/functions_routing.inc.php serveSearch(), the sanitisation pipeline runs urldecode() after HTML-encoding, so a single URL-encoded HTML payload survives strip_tags() and htmlspecialchars() and is then decoded back into live HTML in the page. A crafted search link can execute arbitrary JavaScript in the victim's browser. Fixed in 2.6.1.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
43
EG Risk 43/100CISA 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
Severity61% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
16th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation public PoC (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 13, 2026

Last Modified

September 30, 2026

Advisory Details (2)

Auto-updated Aug 13, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Serendipity 2.3.5 Reflected XSS via search clean-URL route | Advisories | VulnCheck

https://www.vulncheck.com/advisories/serendipity-reflected-xss-via-search-clean-url-route
github Patch Available🟡 PoC Available

Reflected XSS in search clean-URL route (/search/<term>) · Advisory · s9y/Serendipity · GitHub

https://github.com/s9y/Serendipity/security/advisories/GHSA-6c2x-mjmq-vx4q

Vendor Advisories for CVE-2026-73628(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 14× in last 7d / 69× 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 137 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-73628?
CVE-2026-73628 is a medium vulnerability published on August 13, 2026. Serendipity versions >= 2.3.5 and <= 2.6.0 contain a reflected cross-site scripting vulnerability in the search clean-URL route (/search/<term>). In include/functionsrouting.inc.php serveSearch(), the sanitisation pipeline runs urldecode() after HTML-encoding, so a single URL-encoded HTML payload…
When was CVE-2026-73628 disclosed?
CVE-2026-73628 was first published on August 13, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73628 actively exploited?
CVE-2026-73628 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73628?
CVE-2026-73628 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73628?
A fix for CVE-2026-73628 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73628 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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