CVE-2018-25309

HIGHNVD 7.27.2—
EchelonGraph scoreMEDIUM confidence

Score 7.2 from GitHub Security Advisory published 2026-04-29. NVD baseline CVSS 7.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.2Exploit: Elevated riskExposed: 0

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

MyBB Recent threads 17.0 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by creating threads with crafted subject lines. Attackers can create threads with script tags in the subject parameter to execute arbitrary JavaScript in the browsers of all users viewing the index page.

CVSS v3
7.2
EG Score
7.2(medium)
EG Risk
63(Attend)
EG Risk 63/100SSVC: Attend

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
Severity72% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

April 29, 2026

Last Modified

May 24, 2026

Advisory Details (3)

Auto-updated Apr 29, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

MyBB Recent threads 17.0 Persistent Cross-Site Scripting | Advisories | VulnCheck

https://www.vulncheck.com/advisories/mybb-recent-threads-persistent-cross-site-scripting
generic🟡 PoC Available

MyBB Plugin Recent Threads On Index - Cross-Site Scripting - PHP webapps Exploit

https://www.exploit-db.com/exploits/44420
generic
https://community.mybb.com/mods.php?action=view&pid=191

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 42× 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 170 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2018-25309?
CVE-2018-25309 is a high vulnerability published on April 29, 2026. MyBB Recent threads 17.0 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by creating threads with crafted subject lines. Attackers can create threads with script tags in the subject parameter to execute arbitrary JavaScript in the browsers…
When was CVE-2018-25309 disclosed?
CVE-2018-25309 was first published in the National Vulnerability Database on April 29, 2026, with the most recent update on May 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-25309 actively exploited?
CVE-2018-25309 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 82.2% of all scored CVEs.
What is the CVSS score of CVE-2018-25309?
CVE-2018-25309 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2018-25309?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-25309, 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

Explore the affected products and dependency analysis for CVE-2018-25309

Explore →

Is Your Infrastructure Affected by CVE-2018-25309?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs