CVE-2018-25309

Name: CVE-2018-25309
Creator: NVD / NIST
Published: 2026-04-29T20:16:26.463+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.1/10EPSS 0.26%

Last modified Jun 17, 2026

CVE-2018-25309 is a medium-severity vulnerability rated 5.1/10 on the CVSS scale. 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.. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS 4.0

5.1/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.26%

17.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Dragonexpert	Recent Threads On Index	17.0

References

https://community.mybb.com/mods.php?action=view&pid=191Product
https://www.exploit-db.com/exploits/44420Exploit, VDB Entry
https://www.vulncheck.com/advisories/mybb-recent-threads-persistent-cross-site-scriptingThird Party Advisory

Timeline

Published: Apr 29, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2018-25309?

How severe is CVE-2018-25309?

CVE-2018-25309 has a CVSS score of 5.1/10 (MEDIUM severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2018-25309?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-25309?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST