CVE-2026-54770

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Source
https://cve.org/CVERecord?id=CVE-2026-54770
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54770.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-54770
Aliases
Downstream
Related
Published
2026-08-20T16:31:46Z
Modified
2026-09-10T12:26:08Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
WebOb: Open redirect in Location header normalization via leading C0 control / space characters
Details

WebOb provides objects for HTTP requests and responses. Prior to 1.8.11, Response._make_location_absolute() in src/webob/response.py checks a Location value for a URI scheme or leading double slash before urllib.parse.urljoin() strips leading C0 control characters and spaces. An attacker-controlled value such as a space followed by a protocol-relative or absolute URL can therefore bypass SCHEME_RE and startswith("//") checks and be normalized to an off-host redirect. Request.relative_url() and webob.exc._HTTPMove subclasses, including HTTPFound, are also affected because they use the same unsafe URL joining behavior or bypass the earlier normalization path. An unauthenticated attacker who can influence an application's redirect target can send users to an attacker-controlled host for phishing or OAuth and SSO token theft, but exploitation requires the user to follow the redirect. This issue is fixed in version 1.8.11.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-601"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54770.json"
}
References

Affected packages

Git / github.com/pylons/webob

Affected ranges

Type
GIT
Repo
https://github.com/pylons/webob
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
ff89560643fb252751b4db8806a283b5377f1f07
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.8.11"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.8
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.9
0.9.1
0.9.2
0.9.3
0.9.4
0.9.5
0.9.6
0.9.6.1
0.9.7
0.9.7.1
0.9.8
1.*
1.0.1
1.0.2
1.0.3
1.0.4
1.0.5
1.0.6
1.0.7
1.0.8
1.1
1.1b2
1.1rc1
1.2
1.2a1
1.2a2
1.2b1
1.2b2
1.2b3
1.2rc1
1.3
1.3.1
1.4
1.5.0a0
1.8.0
1.8.0rc1
1.8.1
1.8.10
1.8.2
1.8.3
1.8.4
1.8.5
1.8.6
1.8.7
1.8.8
1.8.9
v1.*
v1.8.2
v1.8.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54770.json"