CVE-2026-19855

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-09-09. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.5Exploit: None knownExposed services: Not assessed

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

The CleanTalk WordPress plugin before 6.87 does not prevent unauthenticated, user-supplied comment content from being passed to WordPress's shortcode engine, allowing any visitor to have arbitrary shortcodes registered on the site executed server-side and rendered to every subsequent visitor of the page.

CVSS v3
6.5
EG Score
6.5MEDIUMhigh confidence
EG Risk
44
EG Risk 44/100CISA 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
Severity65% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (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

September 9, 2026

Last Modified

September 9, 2026

Advisory Details (1)

Auto-updated Sep 9, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Spam protection, Honeypot, Anti-Spam by CleanTalk < 6.87 – Unauthenticated Arbitrary Shortcode Execution via Comment Text | CVE 2026-19855 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/c27f3657-261a-46cd-860c-0bdf5c849190/

Vendor Advisories for CVE-2026-19855(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 19× in last 7d / 74× 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. 2026-10-04 23:26 UTCEG score recompute
  2. 2026-10-04 23:26 UTCGHSA enrichment
  3. 2026-10-04 23:21 UTCEPSS rescore
  4. 2026-10-04 00:26 UTCEG score recompute
  5. 2026-10-04 00:25 UTCGHSA enrichment
  6. 2026-10-03 00:12 UTCEG score recompute
  7. 2026-10-03 00:12 UTCGHSA enrichment
  8. 2026-10-02 00:24 UTCEG score recompute
  9. 2026-10-02 00:24 UTCGHSA enrichment
  10. 2026-10-01 19:49 UTCEPSS rescore
  11. 2026-10-01 01:06 UTCEG score recompute
  12. 2026-10-01 01:06 UTCGHSA enrichment
  13. 2026-09-30 15:03 UTCEPSS rescore
  14. 2026-09-30 02:05 UTCEG score recompute
  15. 2026-09-30 02:05 UTCGHSA enrichment
  16. 2026-09-29 15:20 UTCEPSS rescore
  17. 2026-09-28 21:41 UTCEG score recompute
  18. 2026-09-28 21:41 UTCGHSA enrichment
  19. 2026-09-28 13:51 UTCEPSS rescore
  20. 2026-09-27 22:41 UTCEG score recompute
  21. 2026-09-27 22:41 UTCGHSA enrichment
  22. 2026-09-27 13:47 UTCEPSS rescore
  23. 2026-09-26 23:41 UTCEG score recompute
  24. 2026-09-26 23:41 UTCGHSA enrichment
  25. 2026-09-26 15:58 UTCEPSS rescore
Show 49 more
  1. 2026-09-26 00:12 UTCGHSA enrichment
  2. 2026-09-25 01:04 UTCEG score recompute
  3. 2026-09-25 01:04 UTCGHSA enrichment
  4. 2026-09-24 02:03 UTCEG score recompute
  5. 2026-09-24 02:03 UTCGHSA enrichment
  6. 2026-09-23 03:03 UTCEG score recompute
  7. 2026-09-23 03:03 UTCGHSA enrichment
  8. 2026-09-22 04:02 UTCEG score recompute
  9. 2026-09-22 04:02 UTCGHSA enrichment
  10. 2026-09-21 05:01 UTCEG score recompute
  11. 2026-09-21 05:00 UTCGHSA enrichment
  12. 2026-09-20 05:51 UTCEG score recompute
  13. 2026-09-20 05:51 UTCGHSA enrichment
  14. 2026-09-19 06:50 UTCEG score recompute
  15. 2026-09-19 06:50 UTCGHSA enrichment
  16. 2026-09-18 19:27 UTCEPSS rescore
  17. 2026-09-18 07:48 UTCEG score recompute
  18. 2026-09-18 07:48 UTCGHSA enrichment
  19. 2026-09-17 08:48 UTCEG score recompute
  20. 2026-09-17 08:48 UTCGHSA enrichment
  21. 2026-09-16 14:07 UTCEPSS rescore
  22. 2026-09-16 09:47 UTCEG score recompute
  23. 2026-09-16 09:47 UTCGHSA enrichment
  24. 2026-09-16 05:14 UTCEPSS rescore
  25. 2026-09-15 10:46 UTCEG score recompute
  26. 2026-09-15 10:46 UTCGHSA enrichment
  27. 2026-09-14 11:40 UTCEG score recompute
  28. 2026-09-14 11:40 UTCGHSA enrichment
  29. 2026-09-13 16:46 UTCEPSS rescore
  30. 2026-09-13 12:40 UTCEG score recompute
  31. 2026-09-13 12:40 UTCGHSA enrichment
  32. 2026-09-12 15:00 UTCEPSS rescore
  33. 2026-09-12 13:40 UTCEG score recompute
  34. 2026-09-12 13:40 UTCGHSA enrichment
  35. 2026-09-11 14:52 UTCEPSS rescore
  36. 2026-09-11 14:39 UTCEG score recompute
  37. 2026-09-11 14:39 UTCGHSA enrichment
  38. 2026-09-11 09:36 UTCEPSS rescore
  39. 2026-09-10 15:39 UTCEG score recompute
  40. 2026-09-10 15:39 UTCGHSA enrichment
  41. 2026-09-10 09:34 UTCEPSS rescore
  42. 2026-09-09 16:38 UTCGHSA enrichment
  43. 2026-09-09 15:49 UTCEG score recompute
  44. 2026-09-09 15:49 UTCGHSA enrichment
  45. 2026-09-09 15:35 UTCEG score recompute
  46. 2026-09-09 15:35 UTCGHSA enrichment
  47. 2026-09-09 07:20 UTCEG score recompute
  48. 2026-09-09 06:38 UTCEG score recompute
  49. 2026-09-09 06:38 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-19855?
CVE-2026-19855 is a medium vulnerability published on September 9, 2026. The CleanTalk WordPress plugin before 6.87 does not prevent unauthenticated, user-supplied comment content from being passed to WordPress's shortcode engine, allowing any visitor to have arbitrary shortcodes registered on the site executed server-side and rendered to every subsequent visitor of the…
When was CVE-2026-19855 disclosed?
CVE-2026-19855 was first published on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19855 actively exploited?
CVE-2026-19855 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-19855?
CVE-2026-19855 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-19855?
No fix for CVE-2026-19855 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-2026-19855 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-19855

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