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CVE-2018-18903

33
FAUCET Score

CVE-2018-18903 is a critical remote code execution vulnerability affecting Vanilla 2.6.x versions prior to 2.6.4. With a CVSS score of 9.8, this vulnerability allows unauthenticated attackers to execute arbitrary code with high impact on confidentiality, integrity, and availability. While there is no known active exploitation, public exploit code, or KEV listing, the vulnerability has garnered significant community discussion, indicating potential interest.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.6.0, < 2.6.4CPE matchmatch criteria
cpe:2.3:a:vanillaforums:vanilla:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
5.15%
Probability of exploitation in next 30 days
EPSS Percentile
91.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0515 is in the 86th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Remediation records are not available for this CVE.

References

github.com / vanilla/vanilla/releases/tag/Vanilla_2.6.4
Release Notes
open.vanillaforums.com / discussion/36771/security-update-vanilla-2-6-4
Release NotesVendor Advisory
srcincite.io / blog/2018/10/02/old-school-pwning-with-new-school-tricks-vanilla-forums-remote-code-execution.html
ExploitThird Party Advisory