This is a forensic problem dressed as a vulnerability. CVE-2026-68809 describes incomplete cleanup in PowerPoint — not remote code execution, not a memory corruption bug that yields code execution, but the failure to properly erase artifacts after processing. The CVSS 5.5 and EPSS 0.00352 will cause organizations to deprioritize this, and that would be a mistake.
The scoring systems that produce these numbers were built for vulnerabilities requiring active exploitation: can an attacker reach this remotely with acceptable effort? Incomplete cleanup doesn't need active exploitation. It rewards attackers who already have any foothold — a compromised VPN credential, a lateral movement via cached tokens, a phishing foothold that persists across reboots, or physical access to a shared workstation. In modern enterprises, "local access" is a floor that dozens of vectors already clear. The real question isn't "how likely is exploitation?" it's "what happens when this combines with any other initial access?" That makes CVSS 5.5 almost meaningless for prioritization, yet organizations will use it to deprioritize this alongside genuinely low-risk findings.
PowerPoint files routinely contain M&A targets, executive communications, and pre-announcement product plans. If incomplete cleanup leaves trace data on disk or in memory, recovery is trivial for anyone with local access after the fact. The attacker's path is: gain any foothold on a system where PowerPoint was used, then perform forensic recovery of improperly cleaned artifacts. That could be temp files, swap remnants, or in-memory structures that weren't zeroed.
But the exposure doesn't stop at the machine where PowerPoint ran. Temp files written to network shares sync across endpoints. Hypervisor memory snapshots capture application buffers. Backup systems retain image-level copies of disk pages that weren't properly zeroed. A vulnerability that "just" exposes information is actually propagating that information across every backup, snapshot, and sync point in the environment.
The historical pattern is telling. Incomplete cleanup vulnerabilities in Microsoft Office are not random — they cluster around object embedding, OLE linking, and legacy format handling. Office has shipped incremental fixes for temp file artifacts across Word and Excel for over a decade, each addressing a narrow manifestation while adjacent code paths remained untouched. This suggests the cleanup failures aren't isolated bugs but symptoms of a recurring architectural posture where each disclosure is treated as a one-off rather than a signal of systemic weakness. CVE-2026-68809 is probably not the last incomplete cleanup disclosure in this series.
For defenders, this changes the mitigation calculus. Prioritize endpoint forensics and disk encryption over network perimeter controls. Determine whether your environment has shared workstations or multi-user systems where this artifact accumulation could affect other accounts. Check whether PowerPoint is processing sensitive decks on systems with slower patching cadences — the exposure window doesn't close when a patch drops, it closes when every affected system is actually remediated, and that lag is catastrophic for information disclosure.
You should also assume this class operates below the detection threshold of most security tooling. The absence of indicators of compromise isn't evidence of non-exploitation — it's evidence that this vulnerability is nearly impossible to detect in the wild without targeted forensic recovery. After patching, verify that sensitive files processed on affected systems don't have corresponding artifacts lingering in temp directories, pagefiles, or backup images.