Dashboard / CVE-2026-49955

CVE-2026-49955

MEDIUM
MEDIUM Priority: 0.04 BB Relevance: 74/100
Published: 2026-06-09 Modified: 2026-11-08 First seen: 2026-11-08 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
AT: None
VC: None
VI: None
VA: Low

Description

Hermes WebUI before version 0.51.270 contains a resource exhaustion vulnerability that allows unauthenticated remote attackers to degrade service availability by repeatedly calling the passkey options endpoint without completing assertion. Attackers can send unlimited POST requests to the authentication endpoint, causing unbounded growth of the challenge store file and excessive CPU and disk I/O through repeated JSON file rewrites.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
nesquena hermes-webui 0 < 0.51.270

References & Advisories (5)

Bug Bounty Relevance

74 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

6.9 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

EPSS — Exploitation Probability

0.59%
Raw Score 0.005860
Percentile 48.6%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00586
2026-11-12
0.00586
2026-11-10
0.00586
2026-11-09
0.00586
2026-11-08
0.00586

Intelligence Sources

mitre ref →

External Links