CVE-2026-71271

HIGH
MEDIUM Priority: 0.03 BB Relevance: 67/100
Published: 2026-08-05 Modified: 2026-10-24 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Interaction Conf. Impact Scope Change

CVSS Vector Breakdown

AV: Network
AC: Low
PR: Low
UI: None
S: Changed
C: High
I: Low
A: None

Description

Memos' webhook URL validation, isReservedIP (internal/webhook/validate.go), checks a candidate IP against a reservedCIDRs list that omits 0.0.0.0/8 and never calls ip.IsUnspecified — unlike the correctly implemented sibling function isInternalIP in internal/httpgetter/html_meta.go, which does.

Weakness Classification (1)

Bug Bounty Relevance

67 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

8.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

EPSS — Exploitation Probability

0.33%
Raw Score 0.003280
Percentile 25.8%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00328
2026-10-28
0.00328

Intelligence Sources

nvd ref →