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CVE-2026-27480

21
FAUCET Score

CVE-2026-27480 is a timing-based username enumeration vulnerability affecting Static Web Server (SWS) versions 2.1.0 through 2.40.1. This flaw in Basic Authentication allows attackers to distinguish valid usernames from invalid ones by observing response time differences, as valid usernames trigger a slower password verification process. Rated Medium (CVSS 5.3), the vulnerability has a low attack complexity and can lead to information disclosure (username enumeration), facilitating targeted brute-force or credential-stuffing attacks. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.1.0, < 2.41.0CPE matchmatch criteria
cpe:2.3:a:static-web-server:static_web_server:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.35%
Probability of exploitation in next 30 days
EPSS Percentile
27.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0035 is in the 16th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
rustpatch availablevia ghsa
Product: static-web-serverFixed in: 2.41.0

Vendor Advisories (1)

rustGHSA-qhp6-635j-x7r2medium

Static Web Server affected by timing-based username enumeration in Basic Authentication due to early response on invalid usernames

Feb 20, 2026

References

github.com / static-web-server/static-web-server/commit/7bf0fd425eb10dac9bf9ef5febce12c4dd039ce1
Patch
github.com / static-web-server/static-web-server/security/advisories/GHSA-qhp6-635j-x7r2
ExploitVendor Advisory