CVE-2026-27748Disclosure(avira / internet_security)

LOWCVSS 7.1 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft
Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

Avira Internet Security contains an improper link resolution vulnerability in the Software Updater component. During the update process, a privileged service running as SYSTEM deletes a file under C:\\ProgramData without validating whether the path resolves through a symbolic link or reparse point. A local attacker can create a malicious link to redirect the delete operation to an arbitrary file, resulting in deletion of attacker-chosen files with SYSTEM privileges. This may lead to local privilege escalation, denial of service, or system integrity compromise depending on the targeted file and operating system configuration.

avira CVEs Back to dashboard

1.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-59

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

internet_security

Threat summary

Public PoC is present in monitored signal
4 mentions across 4 observed days
Momentum state: stable

What's happening

PoC mentioned or linked in 2 signals
Technical details provided in 3 signals
Disclosure: 3 classified signals
Peaked 3d ago at 1 mentions (2026-03-03); latest day: 1
4 total mentions across 4 days

Affected systems

Vendors

avira

Products

internet_security

Deep dive

Activity timeline4 mentions / 4d

Signal classification2 categories

Disclosure

375.0%

PoC

125.0%

Referenced assets3 URLs

By indicator

Classification over time

Date	Total	Labels

2026-03-03	1	Disclosure1
2026-03-04	1	PoC1
2026-03-05	1	Disclosure1
2026-03-06	1	Disclosure1

Full discourse4 posts

quarkslab@quarkslab221d
Disclosure
Another antivirus 🛡️, another unfulfilled promise 😣. @kaluche_ turns Avira's protection into a privilege escalation playground. 3 LPE vectors via symlink abuse (CVE-2026-27748, CVE-2026-27750) and unsafe deserialization (CVE-2026-27749). Find out more: https://blog.quarkslab.com/avira-deserialize-delete-and-escalate-the-proper-way-to-use-an-av.html https://t.co/aipOEFZqnE
Post summary
The tweet discloses that Avira’s protection can be compromised for privilege escalation through symlink abuse and unsafe deserialization, with a linked blog post providing details.
3381132449.3K
12.2K followersView on X
VulDB 🛡@vuldb219d
Disclosure
We have just added an important vulnerability affecting Gen Digital Avira Internet Security (CVE-2026-27748) https://vuldb.com/?id.349195
Post summary
A new vulnerability, CVE‑2026‑27748 affecting Gen Digital Avira Internet Security, has been added to the vulnerability database.
0000080
2.1K followersView on X
Vulmon Vulnerability Feed@VulmonFeeds219d
Disclosure
CVE-2026-27748 Avira Internet Security Software Updater Privilege Escalation via Symbolic Link Deletion https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-27748
Post summary
The text announces a new privilege‑escalation vulnerability (CVE‑2026‑27748) in Avira Internet Security Software Updater that exploits symbolic link deletion, without indicating any PoC, exploit, or patch.
0000030
4.0K followersView on X
Autumn Good@autumn_good_35221d
PoC
CVE-2026-27748: Arbitrary file delete CVE-2026-27749: LPE via insecure deserialization CVE-2026-27750: LPE via TOCTOU folder delete Avira: Deserialize, Delete and Escalate - The Proper Way to Use an AV - Quarkslab's blog https://blog.quarkslab.com/avira-deserialize-delete-and-escalate-the-proper-way-to-use-an-av.html
Post summary
The blog post discusses three new CVEs affecting Avira, detailing arbitrary file deletion and local privilege escalation via insecure deserialization and TOCTOU folder delete, and provides a proof‑of‑concept for exploitation.
00000356
6.7K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	avira	internet_security	-	windows	-

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What researchers are saying

CVE-2026-27748

quarkslab@quarkslabDisclosure

The tweet discloses that Avira’s protection can be compromised for privilege escalation through symlink abuse and unsafe deserialization, with a linked blog post providing details.

VulDB 🛡@vuldbDisclosure

A new vulnerability, CVE‑2026‑27748 affecting Gen Digital Avira Internet Security, has been added to the vulnerability database.

Vulmon Vulnerability Feed@VulmonFeedsDisclosure

The text announces a new privilege‑escalation vulnerability (CVE‑2026‑27748) in Avira Internet Security Software Updater that exploits symbolic link deletion, without indicating any PoC, exploit, or patch.

Autumn Good@autumn_good_35PoC

The blog post discusses three new CVEs affecting Avira, detailing arbitrary file deletion and local privilege escalation via insecure deserialization and TOCTOU folder delete, and provides a proof‑of‑concept for exploitation.