CVE-2018-18688

MEDIUM
5.3
CVSS Score
Published: January 7, 2021 at 05:38 PM UTC
Updated: June 17, 2026 at 01:47 AM UTC
13 products affected across 8 vendorsPhantomPDFFoxit ReaderLibreoffice· also runs on 3 platforms

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Severity
MEDIUM5.3
Exploit prediction
EPSS 1%

Description

The Portable Document Format (PDF) specification does not provide any information regarding the concrete procedure of how to validate signatures. Consequently, an Incremental Saving vulnerability exists in multiple products. When an attacker uses the Incremental Saving feature to add pages or annotations, Body Updates are displayed to the user without any action by the signature-validation logic. This affects Foxit Reader before 9.4 and PhantomPDF before 8.3.9 and 9.x before 9.4. It also affects LibreOffice, Master PDF Editor, Nitro Pro, Nitro Reader, Nuance Power PDF Standard, PDF Editor 6 Pro, PDFelement6 Pro, PDF Studio Viewer 2018, PDF Studio Pro, Perfect PDF 10 Premium, and Perfect PDF Reader.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

apple-macos (environment) · linux-linux-kernel (environment) · microsoft-windows (environment)
apple-macos (environment) · linux-linux-kernel (environment) · microsoft-windows (environment)
9.0 ≤ v < 9.48.3.9
Affected range stops below 9.4, so it looks safe — our inference, not a vendor statement
microsoft-windows (environment)
microsoft-windows (environment)
microsoft-windows (environment)
apple-macos (environment) · microsoft-windows (environment)
apple-macos (environment) · microsoft-windows (environment)
apple-macos (environment) · linux-linux-kernel (environment) · microsoft-windows (environment)
microsoft-windows (environment)
apple-macos (environment) · linux-linux-kernel (environment) · microsoft-windows (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-347

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