CVE-2026-12939

MEDIUMPre-NVD 6.46.4—
EchelonGraph scoreMEDIUM confidence

Score 6.4 from GitHub Security Advisory published 2026-07-29. a secondary CVSS source baseline 6.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.4Exploit: None knownExposed: 0

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

The Newsletters Lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'link' attribute of the post_thumbnail (and newsletters_post_thumbnail) shortcodes in versions up to and including 4.15. This is due to insufficient input sanitization and output escaping in the post_thumbnail() method in helpers/shortcode.php, which concatenates the user-controlled $link shortcode attribute directly into an href attribute without esc_url() or esc_attr(). This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

CVSS v3
6.4
EG Score
6.4(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity64% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

July 29, 2026

Last Modified

July 30, 2026

References (6)

Vendor Advisories for CVE-2026-12939(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 15× 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.

  1. 2026-08-30 01:21 UTCEPSS rescore
  2. 2026-08-29 23:25 UTCEG score recompute
  3. 2026-08-29 23:25 UTCGHSA enrichment
  4. 2026-08-28 21:40 UTCEPSS rescore
  5. 2026-08-27 14:24 UTCEPSS rescore
  6. 2026-08-27 12:42 UTCEG score recompute
  7. 2026-08-27 12:42 UTCGHSA enrichment
  8. 2026-08-26 13:38 UTCGHSA enrichment
  9. 2026-08-25 14:20 UTCEG score recompute
  10. 2026-08-25 14:20 UTCGHSA enrichment
  11. 2026-08-25 13:48 UTCEPSS rescore
  12. 2026-08-24 15:00 UTCEG score recompute
  13. 2026-08-24 14:59 UTCGHSA enrichment
  14. 2026-08-23 15:55 UTCEG score recompute
  15. 2026-08-23 15:55 UTCGHSA enrichment
  16. 2026-08-23 00:19 UTCEPSS rescore
  17. 2026-08-22 16:52 UTCEG score recompute
  18. 2026-08-22 16:52 UTCGHSA enrichment
  19. 2026-08-21 23:48 UTCEPSS rescore
  20. 2026-08-21 17:48 UTCEG score recompute
  21. 2026-08-21 17:48 UTCGHSA enrichment
  22. 2026-08-20 22:55 UTCEPSS rescore
  23. 2026-08-20 18:44 UTCGHSA enrichment
  24. 2026-08-19 19:40 UTCEG score recompute
  25. 2026-08-19 19:40 UTCGHSA enrichment
Show 66 more
  1. 2026-08-19 17:03 UTCEPSS rescore
  2. 2026-08-18 19:52 UTCEG score recompute
  3. 2026-08-18 19:52 UTCGHSA enrichment
  4. 2026-08-18 13:48 UTCEPSS rescore
  5. 2026-08-17 20:49 UTCEG score recompute
  6. 2026-08-17 20:49 UTCGHSA enrichment
  7. 2026-08-16 21:45 UTCEG score recompute
  8. 2026-08-16 21:45 UTCGHSA enrichment
  9. 2026-08-16 14:56 UTCEPSS rescore
  10. 2026-08-16 02:14 UTCEPSS rescore
  11. 2026-08-15 22:41 UTCEG score recompute
  12. 2026-08-15 22:41 UTCGHSA enrichment
  13. 2026-08-15 01:30 UTCEPSS rescore
  14. 2026-08-14 23:37 UTCGHSA enrichment
  15. 2026-08-14 00:33 UTCEG score recompute
  16. 2026-08-14 00:33 UTCGHSA enrichment
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-13 01:29 UTCEG score recompute
  19. 2026-08-13 01:29 UTCGHSA enrichment
  20. 2026-08-12 13:50 UTCEPSS rescore
  21. 2026-08-12 02:25 UTCEG score recompute
  22. 2026-08-12 02:25 UTCGHSA enrichment
  23. 2026-08-11 13:42 UTCEPSS rescore
  24. 2026-08-11 03:21 UTCEG score recompute
  25. 2026-08-11 03:21 UTCGHSA enrichment
  26. 2026-08-10 23:59 UTCEPSS rescore
  27. 2026-08-10 04:18 UTCEG score recompute
  28. 2026-08-10 04:18 UTCGHSA enrichment
  29. 2026-08-09 13:46 UTCEPSS rescore
  30. 2026-08-09 05:14 UTCEG score recompute
  31. 2026-08-09 05:14 UTCGHSA enrichment
  32. 2026-08-08 16:37 UTCEPSS rescore
  33. 2026-08-08 06:11 UTCEG score recompute
  34. 2026-08-08 06:11 UTCGHSA enrichment
  35. 2026-08-07 07:07 UTCEG score recompute
  36. 2026-08-07 07:07 UTCGHSA enrichment
  37. 2026-08-06 13:46 UTCEPSS rescore
  38. 2026-08-06 08:04 UTCEG score recompute
  39. 2026-08-06 08:04 UTCGHSA enrichment
  40. 2026-08-05 19:17 UTCEPSS rescore
  41. 2026-08-05 09:00 UTCEG score recompute
  42. 2026-08-05 09:00 UTCGHSA enrichment
  43. 2026-08-04 15:09 UTCEPSS rescore
  44. 2026-08-04 10:38 UTCEPSS rescore
  45. 2026-08-04 09:56 UTCEG score recompute
  46. 2026-08-04 09:56 UTCGHSA enrichment
  47. 2026-08-03 10:35 UTCEPSS rescore
  48. 2026-08-03 10:27 UTCGHSA enrichment
  49. 2026-08-02 11:21 UTCEG score recompute
  50. 2026-08-02 11:21 UTCGHSA enrichment
  51. 2026-08-02 02:26 UTCEPSS rescore
  52. 2026-08-01 12:17 UTCEG score recompute
  53. 2026-08-01 12:17 UTCGHSA enrichment
  54. 2026-08-01 04:15 UTCEPSS rescore
  55. 2026-07-31 13:13 UTCEG score recompute
  56. 2026-07-31 13:13 UTCGHSA enrichment
  57. 2026-07-30 16:27 UTCEPSS rescore
  58. 2026-07-30 14:09 UTCEG score recompute
  59. 2026-07-30 14:09 UTCGHSA enrichment
  60. 2026-07-30 01:30 UTCEPSS rescore
  61. 2026-07-29 16:25 UTCEG score recompute
  62. 2026-07-29 16:25 UTCGHSA enrichment
  63. 2026-07-29 15:33 UTCEG score recompute
  64. 2026-07-29 15:33 UTCGHSA enrichment
  65. 2026-07-29 02:19 UTCEG score recompute
  66. 2026-07-29 02:17 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12939?
CVE-2026-12939 is a medium vulnerability published on July 29, 2026. The Newsletters Lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'link' attribute of the postthumbnail (and newsletterspostthumbnail) shortcodes in versions up to and including 4.15. This is due to insufficient input sanitization and output escaping in the…
When was CVE-2026-12939 disclosed?
CVE-2026-12939 was first published in the National Vulnerability Database on July 29, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12939 actively exploited?
CVE-2026-12939 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 89.3% of all scored CVEs.
What is the CVSS score of CVE-2026-12939?
CVE-2026-12939 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-12939?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12939, 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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