MyBB Recent threads 17.0 Persistent Cross-Site Scripting
Priority MEDIUM 62CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00261 18th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| mybb | MyBB Recent threads | 17.0 | — | No fix listed | CNA |
- MyBB Recent threads Vendormybb Affected 17.0 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:dragonexpert:recent_threads_on_index:17.0:*:*:*:*:mybb:*:* | 17.0 | Vulnerable | dragonexpert |
- cpe:2.3:a:dragonexpert:recent_threads_on_index:17.0:*:*:*:*:mybb:*:* Versions 17.0 Vulnerable ·dragonexpert
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-25309
- 2026-10-03 Alias added: GHSA-gcf4-8qvj-pjm9
References
Exploit 1
Other 1
More mybb vulnerabilities
- TI-2011-04621 myBB 1.6.4 Backdoor Arbitrary Command Execution CVSS 4.0CRITICAL 10.0
- TI-2022-08548 Remote code execution in mybb CVSS 3.1HIGH 7.2
- TI-2021-22547 MyBB Timeline Plugin 1.0 Cross-Site Scripting and CSRF CVSS 4.0MEDIUM 6.9
- TI-2023-21959 MyBB before 1.8.36 allows Code Injection by users with certain high privileges. CVSS 3.1HIGH 7.2
- TI-2022-18641 Mail settings' command parameter injection in mybb CVSS 3.1HIGH 7.2
- TI-2025-21092 An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the… CVSS 3.1HIGH 7.6
Sources
- CVE-2018-25309 · CVE Program
- CVE-2018-25309 · NVD
- FIRST EPSS
- GHSA-gcf4-8qvj-pjm9 · GitHub Advisory Database · CC BY 4.0
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