Openwave Messaging Webtop Media Transcoder: security flaw used in attacks
OFFICIAL NAME: Openwave Messaging Limited Webtop Media Transcoder Incorrect Resource Transfer Between Spheres Vulnerability
DO THIS FIRSTFind out if you use it. If you do, apply the vendor's fix. Not sure if you use it? Send this page to your IT provider or security lead and ask.
TECHNICAL SUMMARY Openwave Messaging Limited Webtop Media Transcoder contains an incorrect resource transfer between spheres vulnerability that may allow an authenticated user to process and convert unintended document types if bypassing the Webmail experience.
WHY THIS VERDICT Attacks are confirmed. The vulnerability is 25 days old, so many systems are likely still unpatched.
WHY IT RANKS HERE Exploitation is confirmed by an authoritative source. The confirmation is 1 day old. 3 products are affected.
- HIGHEST CONFIRMED RUNG
- EXPLOITED
- CISA KEV
- LISTED
- EXPLOIT CODE
- NONE KNOWN
How far has it climbed?
01 TALK
▨ REPORTED, NOT CONFIRMEDNEWEST EVIDENCE · 1 SOURCECVE-2026-111793 discussed publicly (CIRCL sighting). CVE-2026-111793 discussed publicly (CIRCL sighting).
02 EXPOSED
□ NOT TRACKED YETNO SOURCE FOR THIS STEP YETWe have no source that counts exposed systems yet. Internet scan data needs a partnership we do not have. No evidence here does not mean nothing is exposed.
03 TRIED
■ CONFIRMEDNEWEST EVIDENCE · 3 INDEPENDENT SOURCESAttacks that worked are confirmed (step 4), so attempts count as confirmed too.
- SRC: CIRCL Vulnerability-Lookup sightings: Exploitation of CVE-2026-111793 reported (CIRCL sighting) · NOV 10
- SRC: CVE List V5 and CISA Vulnrichment: CISA Vulnrichment marks CVE-2026-111793 as actively exploited · NOV 10
- SRC: CISA Known Exploited Vulnerabilities: Openwave Messaging Limited Webtop Media Transcoder Incorrect Resource Transfer Between Spheres Vulnerability · NOV 9
04 EXPLOITED
■ CONFIRMEDNEWEST EVIDENCE · 3 INDEPENDENT SOURCESExploitation of CVE-2026-111793 reported (CIRCL sighting). CISA Vulnrichment marks CVE-2026-111793 as actively exploited.
- SRC: CIRCL Vulnerability-Lookup sightings: Exploitation of CVE-2026-111793 reported (CIRCL sighting) · NOV 10
- SRC: CVE List V5 and CISA Vulnrichment: CISA Vulnrichment marks CVE-2026-111793 as actively exploited · NOV 10
- SRC: CISA Known Exploited Vulnerabilities: Openwave Messaging Limited Webtop Media Transcoder Incorrect Resource Transfer Between Spheres Vulnerability · NOV 9
05 DAMAGE
□ NOT TRACKED YETNO SOURCE FOR THIS STEP YETBreach notices and filings rarely name the flaw that was used, so we cannot link them to this event yet. No evidence here does not mean no harm.
When each thing happened
- DISCLOSED
- EXPLOIT CODE PUBLICNOT YET
- FIRST ATTACK REPORT
- CISA KEV LISTING
- US FEDERAL DEADLINE
THE FIX
CISA's instruction: apply the vendor's fix, or stop using the product if no fix exists. CISA set Nov 24, 2026 as the deadline for US federal agencies. It is a US government deadline; use it as a guide.
Questions to ask this week
- Do we run Openwave Messaging Webtop Media Transcoder? If yes, is it patched or cut off from the internet?
- Who owns fixing it, and by what date?
- Have we checked for signs of attack since the first report, not just since the patch?
How it unfolded
- Attack activity. NOV 9, 2026Openwave Messaging Limited Webtop Media Transcoder Incorrect Resource Transfer Between Spheres Vulnerability
- Attack activity. NOV 10, 2026CISA Vulnrichment marks CVE-2026-111793 as actively exploited
- NOV 10, 2026CVE-2026-111793 discussed publicly (CIRCL sighting) (10 reports)
- Attack activity. NOV 10, 2026Exploitation of CVE-2026-111793 reported (CIRCL sighting)
SOURCES
- [1] CIRCL Vulnerability-Lookup sightings: CVE-2026-111793 discussed publicly (CIRCL sighting), NOV 10
- [2] CIRCL Vulnerability-Lookup sightings: Exploitation of CVE-2026-111793 reported (CIRCL sighting), NOV 10
- [3] CVE List V5 and CISA Vulnrichment: CISA Vulnrichment marks CVE-2026-111793 as actively exploited, NOV 10
- [4] CISA Known Exploited Vulnerabilities: Openwave Messaging Limited Webtop Media Transcoder Incorrect Resource Transfer Between Spheres Vulnerability, NOV 9
- [5] CIRCL Vulnerability-Lookup sightings: 9 more reports