CVE-2026-15747

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Source
https://cve.org/CVERecord?id=CVE-2026-15747
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-15747.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-15747
Downstream
Related
Published
2026-07-14T17:07:32.593Z
Modified
2026-08-07T11:50:37.384821321Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle
Details

Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle.

csrftoken generates and caches one token per session and returns the same value on every call, and csrffield places that value in a hidden csrf_token input. When a response carrying the token also echoes attacker-controlled input and is gzip-compressed, the chosen values and the resulting compressed lengths form a BREACH oracle.

An attacker able to query it can recover the token and pass csrf_protect validation.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15747.json",
    "cna_assigner": "CPANSec",
    "cwe_ids": [
        "CWE-204",
        "CWE-352"
    ]
}
References

Affected packages

Git / github.com/mojolicious/mojo

Affected ranges

Type
GIT
Repo
https://github.com/mojolicious/mojo
Events
Introduced
9ca2244a5bc2bac45e8c61db5adffcb65fe0aa0f
Fixed
643b68560eb15f7a06ba4265d59e5a592c6fc332
Fixed
01921fbbbbeca2d1397e082d4a647f9b84c24e27
Database specific 
{
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "4.59"
        },
        {
            "fixed": "9.48"
        }
    ]
}

Affected versions

v4.*
v4.59
v4.60
v4.61
v4.62
v4.63
v4.64
v4.65
v4.66
v4.67
v4.68
v4.69
v4.70
v4.71
v4.72
v4.73
v4.74
v4.75
v4.76
v4.77
v4.78
v4.79
v4.80
v4.81
v4.82
v4.83
v4.84
v4.85
v4.86
v4.87
v4.88
v4.89
v4.90
v4.91
v4.92
v4.93
v4.94
v4.95
v4.96
v4.97
v4.98
v4.99
v5.*
v5.0
v5.01
v5.02
v5.03
v5.04
v5.05
v5.06
v5.07
v5.08
v5.09
v5.10
v5.11
v5.12
v5.13
v5.14
v5.15
v5.16
v5.17
v5.18
v5.19
v5.20
v5.21
v5.22
v5.23
v5.24
v5.25
v5.26
v5.27
v5.28
v5.29
v5.30
v5.31
v5.32
v5.33
v5.34
v5.35
v5.36
v5.37
v5.38
v5.39
v5.40
v5.41
v5.42
v5.43
v5.44
v5.45
v5.46
v5.47
v5.48
v5.49
v5.50
v5.51
v5.52
v5.53
v5.54
v5.55
v5.56
v5.57
v5.58
v5.59
v5.60
v5.61
v5.62
v5.63
v5.64
v5.65
v5.66
v5.67
v5.68
v5.69
v5.70
v5.71
v5.72
v5.73
v5.74
v5.75
v5.76
v5.77
v5.78
v5.79
v5.80
v5.81
v5.82
v6.*
v6.0
v6.01
v6.02
v6.03
v6.04
v6.05
v6.06
v6.07
v6.08
v6.09
v6.10
v6.11
v6.12
v6.13
v6.14
v6.15
v6.16
v6.17
v6.18
v6.19
v6.20
v6.21
v6.22
v6.23
v6.24
v6.25
v6.26
v6.27
v6.28
v6.29
v6.30
v6.31
v6.32
v6.33
v6.34
v6.35
v6.36
v6.37
v6.38
v6.39
v6.40
v6.41
v6.42
v6.43
v6.44
v6.45
v6.46
v6.47
v6.48
v6.49
v6.50
v6.51
v6.52
v6.53
v6.54
v6.55
v6.56
v6.57
v6.58
v6.59
v6.60
v6.61
v6.62
v6.63
v6.64
v6.65
v6.66
v7.*
v7.0
v7.01
v7.02
v7.03
v7.04
v7.05
v7.06
v7.07
v7.08
v7.09
v7.10
v7.11
v7.12
v7.13
v7.14
v7.15
v7.16
v7.17
v7.18
v7.19
v7.20
v7.21
v7.22
v7.23
v7.24
v7.25
v7.26
v7.27
v7.28
v7.29
v7.30
v7.31
v7.32
v7.33
v7.34
v7.35
v7.36
v7.37
v7.38
v7.39
v7.40
v7.41
v7.42
v7.43
v7.44
v7.45
v7.46
v7.47
v7.48
v7.49
v7.50
v7.51
v7.52
v7.53
v7.54
v7.55
v7.56
v7.57
v7.58
v7.59
v7.60
v7.61
v7.62
v7.63
v7.64
v7.65
v7.66
v7.67
v7.68
v7.69
v7.70
v7.71
v7.72
v7.73
v7.74
v7.75
v7.76
v7.77
v7.78
v7.79
v7.80
v7.81
v7.82
v7.83
v7.84
v7.85
v7.86
v7.87
v7.88
v7.89
v7.90
v7.91
v7.92
v7.93
v7.94
v8.*
v8.0
v8.01
v8.02
v8.03
v8.04
v8.05
v8.06
v8.07
v8.08
v8.09
v8.10
v8.11
v8.12
v8.13
v8.14
v8.15
v8.16
v8.17
v8.18
v8.19
v8.20
v8.21
v8.22
v8.23
v8.24
v8.25
v8.26
v8.27
v8.28
v8.29
v8.30
v8.31
v8.32
v8.33
v8.34
v8.35
v8.36
v8.37
v8.38
v8.39
v8.40
v8.41
v8.42
v8.50
v8.51
v8.52
v8.53
v8.54
v8.55
v8.56
v8.57
v8.58
v8.59
v8.60
v8.61
v8.62
v8.63
v8.64
v8.65
v8.66
v8.67
v8.68
v8.69
v8.70
v8.71
v8.72
v8.73
v9.*
v9.0
v9.01
v9.02
v9.03
v9.07
v9.08
v9.09
v9.10
v9.11
v9.12
v9.13
v9.14
v9.15
v9.16
v9.17
v9.18
v9.19
v9.20
v9.21
v9.22
v9.23
v9.24
v9.25
v9.26
v9.27
v9.28
v9.29
v9.30
v9.31
v9.32
v9.33
v9.34
v9.35
v9.36
v9.37
v9.38
v9.39
v9.40
v9.41
v9.42
v9.43
v9.44
v9.45
v9.46
v9.47

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-15747.json"