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Vulnerability Details :

CVE-2026-46431

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-26 May, 2026 | 16:42
Updated At-26 May, 2026 | 17:39
Rejected At-
Credits

Algernon: Auto-refresh SSE event server sets Access-Control-Allow-Origin: *

Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server's Access-Control-Allow-Origin response header was hardcoded to the wildcard * regardless of the caller's Origin. Because EventSource does not preflight and does not send cookies, the wildcard is sufficient to let any third-party page the developer visits open a cross-origin EventSource to the SSE port and read the live filename stream from JavaScript. This vulnerability is fixed in 1.17.7.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:26 May, 2026 | 16:42
Updated At:26 May, 2026 | 17:39
Rejected At:
â–¼CVE Numbering Authority (CNA)
Algernon: Auto-refresh SSE event server sets Access-Control-Allow-Origin: *

Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server's Access-Control-Allow-Origin response header was hardcoded to the wildcard * regardless of the caller's Origin. Because EventSource does not preflight and does not send cookies, the wildcard is sufficient to let any third-party page the developer visits open a cross-origin EventSource to the SSE port and read the live filename stream from JavaScript. This vulnerability is fixed in 1.17.7.

Affected Products
Vendor
xyproto
Product
algernon
Versions
Affected
  • < 1.17.7
Problem Types
TypeCWE IDDescription
CWECWE-942CWE-942: Permissive Cross-domain Policy with Untrusted Domains
Type: CWE
CWE ID: CWE-942
Description: CWE-942: Permissive Cross-domain Policy with Untrusted Domains
Metrics
VersionBase scoreBase severityVector
3.14.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Version: 3.1
Base score: 4.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/xyproto/algernon/security/advisories/GHSA-hw27-4v2q-5qff
x_refsource_CONFIRM
Hyperlink: https://github.com/xyproto/algernon/security/advisories/GHSA-hw27-4v2q-5qff
Resource:
x_refsource_CONFIRM
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/xyproto/algernon/security/advisories/GHSA-hw27-4v2q-5qff
exploit
Hyperlink: https://github.com/xyproto/algernon/security/advisories/GHSA-hw27-4v2q-5qff
Resource:
exploit
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:26 May, 2026 | 17:16
Updated At:26 May, 2026 | 18:16

Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server's Access-Control-Allow-Origin response header was hardcoded to the wildcard * regardless of the caller's Origin. Because EventSource does not preflight and does not send cookies, the wildcard is sufficient to let any third-party page the developer visits open a cross-origin EventSource to the SSE port and read the live filename stream from JavaScript. This vulnerability is fixed in 1.17.7.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.14.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Type: Secondary
Version: 3.1
Base score: 4.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-942Secondarysecurity-advisories@github.com
CWE ID: CWE-942
Type: Secondary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/xyproto/algernon/security/advisories/GHSA-hw27-4v2q-5qffsecurity-advisories@github.com
N/A
https://github.com/xyproto/algernon/security/advisories/GHSA-hw27-4v2q-5qff134c704f-9b21-4f2e-91b3-4a467353bcc0
N/A
Hyperlink: https://github.com/xyproto/algernon/security/advisories/GHSA-hw27-4v2q-5qff
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/xyproto/algernon/security/advisories/GHSA-hw27-4v2q-5qff
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource: N/A

Change History

0
Information is not available yet

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