CVE-2026-77186

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Source
https://cve.org/CVERecord?id=CVE-2026-77186
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77186.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-77186
Published
2026-09-09T03:28:47Z
Modified
2026-09-11T03:30:30Z
Severity
  • 6.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
Summary
My Calendar <= 3.8.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'fallback' Shortcode Attribute
Details

The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'fallback' Shortcode Attribute in all versions up to, and including, 3.8.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The bypass relies on hex-encoded shortcode attribute payloads (e.g. \x3cscript\x3e), which wp_kses_post cannot strip on save because they appear as literal backslash sequences rather than real HTML tags; WordPress core's shortcode_parse_atts() then calls stripcslashes() at render time, decoding the escapes into real angle brackets before they reach the unescaped sink.

Database specific 
{
    "cna_assigner": "Wordfence",
    "cwe_ids": [
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77186.json"
}
References

Affected packages

Git / github.com/joedolson/my-calendar

Affected ranges

Type
GIT
Repo
https://github.com/joedolson/my-calendar
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
89bbf7314fac84cdb89e520e8b7b6d69eee8dd3c
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "3.8.3"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

3.*
3.2.0-RC1
v.*
v.3.0.6
v.3.7.11
v3.*
v3.0.0
v3.0.1
v3.0.10
v3.0.11
v3.0.12
v3.0.13
v3.0.14
v3.0.15
v3.0.16
v3.0.17
v3.0.18
v3.0.3
v3.0.4
v3.0.5
v3.0.7
v3.0.8
v3.0.9
v3.1.0
v3.1.1
v3.1.10
v3.1.11
v3.1.12
v3.1.13
v3.1.14
v3.1.15
v3.1.16
v3.1.17
v3.1.18
v3.1.2
v3.1.3
v3.1.4
v3.1.6
v3.1.7
v3.1.8
v3.1.9
v3.2.0
v3.2.0-beta
v3.2.10
v3.2.11
v3.2.12
v3.2.13
v3.2.14
v3.2.15
v3.2.16
v3.2.17
v3.2.2
v3.2.3
v3.2.4
v3.2.5
v3.2.6
v3.2.8
v3.2.9
v3.3.0
v3.3.0-RC1
v3.3.0-RC2
v3.3.0-RC3
v3.3.0-RC4
v3.3.0-alpha-2
v3.3.0-beta-1
v3.3.1
v3.3.10
v3.3.11
v3.3.12
v3.3.13
v3.3.14
v3.3.15
v3.3.16
v3.3.17
v3.3.18
v3.3.19
v3.3.2
v3.3.20
v3.3.21
v3.3.22
v3.3.23
v3.3.24
v3.3.24.1
v3.3.3
v3.3.4
v3.3.5
v3.3.6
v3.3.7
v3.3.8
v3.3.9
v3.4.0
v3.4.0-RC-1
v3.4.0-RC-2
v3.4.0-RC-3
v3.4.0-RC-4
v3.4.0-beta-1
v3.4.0-beta-2
v3.4.0-beta-3
v3.4.1
v3.4.10
v3.4.11
v3.4.12
v3.4.13
v3.4.14
v3.4.15
v3.4.16
v3.4.17
v3.4.18
v3.4.19
v3.4.2
v3.4.20
v3.4.21
v3.4.3
v3.4.4
v3.4.5
v3.4.6
v3.4.7
v3.4.8
v3.4.9
v3.5.0
v3.5.0-alpha
v3.5.0-beta1
v3.5.0-beta2
v3.5.0-beta3
v3.5.0-rc1
v3.5.0-rc2
v3.5.1
v3.5.10
v3.5.11
v3.5.12
v3.5.13
v3.5.14
v3.5.15
v3.5.16
v3.5.17
v3.5.18
v3.5.19
v3.5.2
v3.5.20
v3.5.21
v3.5.3
v3.5.4
v3.5.5
v3.5.6
v3.5.7
v3.5.8
v3.5.9
v3.6.0
v3.6.0-RC1
v3.6.0-beta1
v3.6.1
v3.6.10
v3.6.11
v3.6.12
v3.6.13
v3.6.14
v3.6.15
v3.6.16
v3.6.2
v3.6.3
v3.6.4
v3.6.5
v3.6.6
v3.6.7
v3.6.8
v3.6.9
v3.7.0
v3.7.0-beta
v3.7.0-rc1
v3.7.1
v3.7.10
v3.7.12
v3.7.13
v3.7.14
v3.7.15
v3.7.16
v3.7.17
v3.7.2
v3.7.3
v3.7.4
v3.7.5
v3.7.6
v3.7.7
v3.7.8
v3.7.9
v3.8.0
v3.8.1
v3.8.2
v3.8.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77186.json"