Denial of Service Vulnerability in Elgg Provides Unrestricted Avatar Uploads
CVE-2026-65650

4.3MEDIUM

Key Information:

Vendor

Elgg

Status
Elgg
Vendor
CVE Published:
22 July 2026

What is CVE-2026-65650?

Elgg versions before 7.0.0 allow an attacker to exploit the image upload feature by submitting oversized avatar images, leading to potential Denial of Service conditions. The application fails to adequately validate image dimensions, which can overwhelm system resources. This vulnerability underscores the importance of implementing stricter input validation controls to maintain system performance and availability.

Affected Version(s)

Elgg 0 < 6.3.5

Elgg 7.0.0-rc.1 < 7.0.0

References

https://github.com/Elgg/Elgg/compare/7.0.0-rc.1...7.0.0
https://github.com/Elgg/Elgg/commit/ab91d59dc2caaa3fdbfe7...
https://github.com/Elgg/Elgg/pull/15041

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.